Does anyone know how far in advance you can get a re-entry permit for overseas travel whilst already in Thailand on a Marriage visa? I am travelling briefly to Malaysia from Thailand in October and was thinking of getting the re-entry permit now.
TLDR : Answer Summary
You can obtain a re-entry permit at any time while on a Marriage visa in Thailand. There is no specific time limit; it can be acquired when you get your visa extension, at the airport when you leave, or at any point in between.