Updated November 11, 2026

B1/B2 visa length of stay: I-94 rules, the 6-month limit and how to extend

The typical initial B-1/B-2 visa length of stay is 1 to 6 months, and USCIS states that 6 months is the standard initial maximum while 1 year is generally the maximum total stay permitted on any one trip with an extension. Your visa stamp only lets you travel to a US port of entry to request admission. A US Customs and Border Protection (CBP) officer sets your actual permitted stay on Form I-94, and you must leave the United States on or before the Admit Until Date shown on that record.

Visa validity vs. length of stay: who decides how long you can stay

Having a B-1 or B-2 visitor visa in your passport does not guarantee entry to the United States, and the expiration date on the visa sticker is not how long you can stay. CBP explains that a visa simply shows a US consular officer reviewed your application and determined you are eligible to travel to a port of entry for a specific purpose, such as tourism, business or medical treatment.

When you arrive at the airport, seaport or land border, a CBP officer conducts an inspection to decide whether you are eligible for admission under US immigration law and authorizes your period of stay. USCIS notes that for a B-1 temporary business visitor, the initial period of stay in the standard table is 1 to 6 months (with 6 months as the maximum), and that at the port of entry a CBP officer may admit you initially for the period needed to carry out your activities, up to a maximum period of 1 year. For B-1 or B-2 visitors given the standard six-month period, CBP states that the six-month period is computer-generated starting on the day you arrive in the United States.

Every allowed stay and deadline on a visitor trip comes down to the document created at that border inspection: Form I-94.

Key B-1/B-2 stay timeframes and deadlines from USCIS and CBP guidance

How to check your Form I-94 and read your Admit Until Date

The Department of Homeland Security (DHS) issues Form I-94, the Arrival/Departure Record, to nonimmigrants who are admitted to the United States, adjusting status or extending their stay. All visitors need a Form I-94 except US citizens, returning resident aliens, noncitizens with immigrant visas and most Canadian citizens visiting or in transit.

USCIS states that a visitor must exit the United States on or before the departure date stamped on Form I-94, which is called the Admit Until Date on the electronic Form I-94. Since April 30, 2013, most arrival and departure records have been created electronically upon arrival. Foreign visitors no longer need to fill out a paper Form I-94, including at the land border, where CBP now issues I-94s electronically instead of handing out a paper stub.

Since May 2019, CBP has used 11-character alphanumeric I-94 numbers (also called the Departure Number or Admission Record Number) consisting of 9 digits, followed by a letter in the 10th position and a digit in the 11th position. Unexpired numeric-only I-94s remain valid until their Admit Until Date.

Use this checklist right after every entry to confirm your legal departure deadline:

• Open the CBP I-94 website or the CBP Link mobile app and select Get Most Recent I-94 to view your electronic record, view your travel history, or see how much longer you can remain in the US based on the terms of your admission.
• Read the Admit Until Date on that electronic record. That date, not your visa expiration date, is the final day of your authorized stay.
• Print a copy if you need paper proof. You can print your own Form I-94 from the website or the CBP Link mobile app. Asking for a paper form during border inspection moves your inspection to a secondary setting.
• Apply in advance if you are entering by land and need an I-94. CBP recommends using the CBP Link mobile app or the CBP I-94 website before you reach the land border.
• Check whether your record needs a correction or replacement. CBP operates over 70 Deferred Inspection Sites across the United States and outlying territories where travelers are referred when documentation needs review or correction. If you lose a Form I-94 or cannot get your Form I-94 from the CBP website, USCIS states you may file Form I-102, Application for Replacement/Initial Nonimmigrant Arrival-Departure Record.

Side trips to Canada, Mexico and other countries: how your timeline works

Crossing the border into Canada or Mexico for a weekend does not reset your six-month stay when you come back into the United States. CBP states directly that it does not.

During your US visit on a B-1 or B-2 visa, you may travel to Canada or Mexico for up to 30 days and re-enter the United States, provided you re-enter within the timeframe shown on the Form I-94 you received when you first arrived. Your original six-month clock keeps running.

Here is the worked calendar example from CBP's own guidance, broken down step by step with our day-count calculation so you can plan your own dates:

• Initial US arrival (July 10): You arrive in the United States on July 10 with a B-2 visitor visa. Your computer-generated six-month stay begins on the day you arrive.
• Side trip to Canada or Mexico (December 10): Five months into your trip, on or after December 10, you travel to Canada or Mexico for a visit of up to 30 days.
• Final departure deadline (January 10): Because the trip to Canada or Mexico is up to 30 days within your initial admission, your original Form I-94 timeframe still controls. Your six-month period ends on January 10, and you must depart the United States on that same day to avoid an overstay unless you applied for an extension of stay.
• By our calculation from CBP's July 10 to January 10 example, a side trip starting on December 10 leaves exactly 31 calendar days remaining on your initial admission (out of 184 total days between July 10 and January 10). CBP also recommends that you do not wait until the last day of your six-month stay to make travel plans because unexpected emergencies can happen.

Visiting non-contiguous countries and the de facto resident rule

Traveling to countries beyond Canada and Mexico works differently. CBP explains that if you visit other countries such as England or Costa Rica and then return to the United States, your return is treated as a brand-new admission rather than a re-entry from a contiguous country during your initial visit.

Because it is a new admission, CBP warns that the inspection may be more strenuous. The inspecting CBP officer will want evidence that you intend to go back home to your country of citizenship to live, rather than returning again and again to the United States after visits to other countries.

CBP's rule for frequent long-stay visitors is clear: a B-1 or B-2 visa allows you to travel to the United States to visit, and if the CBP officer suspects that you are attempting to be a de facto resident, you will be refused entry. Re-entry also depends on your ongoing eligibility, so if you have been arrested or committed an illegal act resulting in a warrant since your visa was issued, you may be refused entry.

How to extend your B1/B2 stay with Form I-539

If your plans change and you want to stay in the United States beyond the date on your Form I-94 without leaving the country, you must file Form I-539, Application to Extend/Change Nonimmigrant Status, and submit your supporting documents to USCIS. For B-1 status, USCIS states that an extension of stay may be granted for up to 6 months, and the maximum total amount of time permitted on any one trip is generally 1 year.

Timing is critical. You must submit Form I-539 online or by mail before the expiration date on your Form I-94. USCIS recommends applying at least 45 days before your authorized stay expires, or as soon as you know you need to extend or change your status. Even if you are approved for another status in the future, USCIS requires you to file Form I-539 to bridge any gap between the expiration of your current status and the start of your future status.

By our calculation from the USCIS timelines, if you enter the United States with a 6-month (about 180-day) admission, the 45-day recommended filing window means you should prepare and submit Form I-539 around day 135 of your trip (about 4.5 months after arrival).

USCIS states that you may apply to extend your stay if you meet all five conditions:

• You were lawfully admitted into the United States with a nonimmigrant visa.
• Your nonimmigrant visa status remains valid.
• You have not committed any crimes that make you ineligible for a visa or any act that makes you ineligible for an immigration benefit.
• You have not violated the conditions of your admission (such as working without authorization).
• Your passport is valid and will remain valid for the entire requested period of stay.

Form I-539 filing checklist, edition rules and who cannot extend

Before you mail or submit Form I-539 online, check the currently accepted edition date at the bottom of the Form I-539 page on USCIS's website before mailing. If you file on paper, make sure the edition date and page numbers are visible at the bottom of every page and that all pages come from the same edition.

Use this USCIS filing checklist to avoid an automatic rejection (and note that USCIS does not refund filing fees if a case is denied):

• Complete all mandatory rejection fields in Part 1 (Information About You): Family Name, Mailing Address, Date of Birth and Current nonimmigrant status.
• Complete all mandatory rejection fields in Part 2 (Application Type): the box for what you are applying for (1, 2 or 3.a), the status you are requesting (3.b or 3.c) and the Total number of People Included in This Application.
• Include Form I-539A if family members are co-applicants, and make sure Part 1 Family Name is filled in on every Form I-539A.
• Sign the form. USCIS rejects any unsigned Form I-539.
• Check that your visa category is eligible. You cannot apply to extend or change status if you were admitted under the Visa Waiver Program (WT or WB), as a crew member (D), in transit (C or TWOV), as a fiancé(e) or dependent (K-1 or K-2), or as an informant (S). Principal employment-based workers (such as E, H-1B, L-1, O, P, Q-1, R-1 and TN) use Form I-129 instead of Form I-539.

What happens if you overstay your Form I-94 or file late

If your authorized stay expires before you file Form I-539 with USCIS, or if you violate the terms of your status such as by working without authorization, USCIS states that you are out of status. If you remain in the United States longer than authorized, you may be barred from returning and/or removed (deported) from the United States. Staying past the period granted can also hurt your ability to get other immigration benefits or return on a future trip. If you fall out of status, USCIS recommends that you leave the United States to limit the possible impact on your ability to come back in the future.

USCIS will excuse a late Form I-539 submission only in very limited circumstances if you show all five of these when you file:

• The delay was due to extraordinary circumstances beyond your control.
• The length of the delay was reasonable.
• You have not otherwise violated your status.
• You are still a bona fide nonimmigrant.
• You are not in removal proceedings.

How to make sure CBP records your departure when leaving by air or land

Leaving on or before your Admit Until Date only protects your record if CBP knows you left. How your departure is recorded depends on how you exit the United States.

If you leave by air or sea, there is nothing extra you need to do. The commercial carrier or CBP records your departure electronically through manifest information. If you happen to hold a paper Form I-94, surrender it to the commercial carrier, the Canadian Border Services Agency (CBSA) or CBP when you leave.

If you arrived by air, sea or land with an electronic I-94 and depart via land into Canada or Mexico, CBP warns that your departure may not be recorded accurately unless you re-enter the United States before the expiration date stamped in your passport. If you are not a resident of Canada or Mexico, leave by land and do not re-enter the United States before your expiration date, follow CBP's steps to protect your travel history:

• Use the CBP Link mobile application to register your departure, or turn in any paper Form I-94 to CBSA upon entering Canada or to CBP at the US port of entry before entering Mexico.
• Ask for an entry stamp in your passport from CBSA when entering Canada or from the Instituto Nacional de Migracion (INM) when entering Mexico.
• Keep physical proof of when you left the United States and carry it on your next return trip. CBP lists acceptable evidence of departure as passport entry stamps, transportation tickets, pay stubs and other receipts.

What rules apply to B-1 business visitors and accompanying family

Because length of stay is tied to keeping valid status, your activities during those months must match your admission category. USCIS states that to qualify for B-1 business visitor status, you must show that your trip is for legitimate business, you plan to remain for a specific limited period, you have enough funds to cover your stay, and you have a foreign residence you do not intend to abandon along with other binding ties.

Permitted B-1 activities include consulting with business associates, attending scientific, professional or business conventions on specific dates, negotiating contracts, and short-term training. Spouses and children of B-1 visa holders are not eligible for a dependent visa, so each family member must apply separately for a B-2 visitor visa and follow B-2 length of stay rules.

Practice example

How long do you plan to stay in the United States, and why was your last visit almost six months long?

State your exact arrival and departure dates in your first sentence so they match your travel itinerary and DS-160. Explain the specific, time-bound purpose of your current trip, whether that is a two-week business conference or a one-month family visit, and do not treat the six-month computer-generated maximum as a target stay. Next, address your previous long stay directly with dates and facts: explain what happened during that visit, confirm that you departed on or before the Admit Until Date on your electronic Form I-94 (or before a timely Form I-539 extension expired), and mention that you did not work without authorization. Have your prior travel dates, return flight confirmation, proof of funds to cover your expenses, and evidence of your residence and ongoing employment or family commitments abroad ready to show that you live in your home country and are not using a B-1/B-2 visa to live in the United States.

Consular and CBP officers check that you plan to remain for a specific limited period, have a residence abroad you do not intend to abandon, and are not attempting to become a de facto resident through repeated long visits.

This is interview practice, not legal advice. For questions about your own case, talk to an immigration attorney. Visaful is not affiliated with the U.S. government or the Department of State.