Yes, I believe so that was the premise I went with. My PCR test place usually will get it back to you in less than 24 hours. So I took the test the morning of the 9th for a 10th departure. But when arriving if they give you any problems explain to them you got the test 72 hours before your flight departure. Since my test results were taken the 9th US time, but I'll be arriving the 12th into Thailand, if they give me any problems I will explain it has only been 48 hours since my test.