When is the immigration office at Suvarnabhumi Airport open and can I get a return stamp for my education visa for more than 3 weeks?

The immigration office at Suvarnabhumi Airport operates 24/7, allowing for entry and exit stamp processing at any time. To obtain a Re-Entry Permit, you can visit the immigration office located at International Departure Gate 2, and no additional documentation is required for the application. However, the validity of the re-entry permit is tied to the expiration of your current visa stamp, so the duration allowed for re-entry, such as more than three weeks, will depend on the details of your existing visa.