My mum just got SETV in London arriving here in Thailand soon. It's for approx 8 weeks. If she wants to take a weekend trip to another country can she pay 1900 baht or whatever for a re-entry permit on the way out of BKK airport? Or SETV is strictly single entry? Sorry for dumb question. Thank you. I can add a photo here of the visa when she gets it stamped in her passport today.
TLDR : Answer Summary
The SETV (Single Entry Tourist Visa) allows for a stay of 60 days in Thailand. If your mum plans to leave Thailand for a weekend trip to another country and wants to return, she can acquire a re-entry permit for 1,000 baht at the airport when exiting. However, this permit will not extend her initial stay, which remains at 60 days from the date of entry.