Not to confuse anyone, the 5 minute rapid tests by ABBOT labs which have appeared and test debuted any some airports to LHR etc are not allowed. Thailand is RT-PCR only, because of the sensitivity
Wow. Where are the flights from? Coming from US to BKK best connect from west coast is about an 18 hour evolution. Best "guarantee" for expedited test results I have seen is 5pm next day. 72 hours before landing pretty much impossible.