Hi. Hopefully flying out to Bangkok and arriving Friday on the old test and go scheme. After the one night stay I will travel up to Udon. Will it then be OK to do my TM30 report on the Monday as this will be over the 24 hour window. I am assuming immigration is closed over the weekend. Thanks for any help.
TLDR : Answer Summary
The TM30 report can be done by your hotel in Bangkok during your one-night stay, so there's no need to worry. You can complete your own TM30 report once you arrive in Udon on Monday, even if this exceeds the 24-hour window since you arrived.