Fly on the 23-12-21 at 7:25am when do I need my RT- PCR result to start from does anybody know how long it lasts Do I need my results to start from the day before or is it 48 to 72 hours before you fly thank you

What are the requirements to fly domestically post quarantine? I’ll be doing my ASQ in Bangkok but I was looking to go to Phuket afterwards. Do I need negative pcr/proof of quarantine to fly? How recent does the pcr test need to be? Am I better off going right after my quarantine, if so how many hours post quarantine should my flight be? Will I need to quarantine again in Phuket or if I come back to BKK?