Hello all, this coming winter I will be spending 3 and a half months in Thailand. Arriving 1 December, leaving 14 th March. I will leave France with an SETV  2 months . Before the two months are up I will be going to Langkawi /Penang for a  week. I know I can come back into Thailand on a visa exempt stamp for one month.  My question is, can I extend this stamp for a month to cover my 3 and a half months stay ? Or should I get another SETV in Penang ? Actually , I am only needing a whole week when coming back in from Penang. I don't mind the extra cost or bother of another visa if it's necessary. ( in the past I used double entries which were perfect for me but no longer available  unfortunately, I do not qualify for retirement or METV) . Thanks .

Both your Tourist Visa's and Visa-Exempt entry's permissions-of-stay can be extended for 30-days for 1900 Baht at a local immigration office.