Visa day limits & residency rules

Most countries cap short stays in one of three ways: a per-entry limit that resets each time you enter, a rolling-window limit like Schengen's 90 days in any 180, or an annual limit per calendar year or per 365 days. The counting method matters as much as the number, because rolling windows never reset at the border.

In most systems, yes. Any calendar day you are physically in the country generally counts as a full day, including the day you arrive and the day you leave. A handful of rules count differently, which is exactly why each rule page here spells out its own counting method.

Typical consequences are fines, deportation, and re-entry bans lasting one to ten years, and an overstay record makes future visa applications harder everywhere. Electronic entry-exit systems now detect overstays automatically in the EU, the US, and many other countries.

Visa limits are ceilings: stay under the number or lose entry rights. Residency and citizenship rules are usually floors: green card holders must avoid long absences, UK settlement caps absences at 180 days per year, and naturalization requires minimum physical presence. Both kinds are day-counting problems in opposite directions.

ESTA and ETIAS are pre-screening authorisations for visa-free travelers, not visas. They let you board a flight but do not change the day limit: ESTA still means 90 days per entry in the US, and ETIAS still means 90 days in any 180 in Schengen.