I have a multiple entry non b. Stamp is 9th September. How does it work when i leave and come back in. If i left on the 4th and came back on the 6th September, before my stamp expires will i get 3 month stamp. If i leave on the 8th September and come back on the 10th or 11th everything will be ok and i will just get a 3 month stamp again? First time with a multiple entry visa! Advice will be greatly appreciated. Thank You.

Every time you enter the country before the "enter before" date on your visa you will get a 90 day permission to stay, even if on the actual "enter before" date (but it's wise to go a day early in case of unforeseen circumstances).

If you enter the country after the "enter before" date your visa will have expired and you will get whatever Visa Exempt period your nationality is entitled to.

In both cases you will get a new 90 day permisison to stay.

Every time you enter Thailand you get a new 90 days, but only while the visa itself (you got from the consulate) is still valid. So keep that date in mind.

Cool thanks. Had to check. Getting silly now at borders and immigration offices.