[Question] Repeated visits & Session

[TigersWay]

Hi, For multiple reasons - like simple webpage refresh, or swapping from browser and back on mobile, etc - multiple visits are logged. FirstVisit is supposed to help and it does. But more than half the time, a visit with the same [ip, userAgent, path, referrer] is logged with a different Session even a few seconds later. In those cases, FirstVisit becomes useless.

How and when a new Session is calculated? Is a multiple visit officially allowed very quickly?

Thanks