@Stuart ********
Hey Stuart, I did as you said and it worked, visa until 2th January, thanks for your advice!
Do you have any idea about this : I plan to go to Vietnam for 1 month and return to Thailand on 1st February. As the visa exemption is 45 days + extension 30days, I don't see the point of asking a tourist visa. Do you think it's doable to come back with the same scheme or there is a limit to it?