@Ellie ******
- 24 hours from the time you enter Thailand. So for example if you stay in a hotel in BKK before going onto CM , that hotel should be the first update on the TM30 and then next day you fly to CM , 24 hours after you land. But as I said, CM Immigration whilst wanting a completed updated TM30 are not strict about the 24 hour period. I know this from my own experience.