Hello, my wife and I (US citizens) will be arriving in Bangkok on June 20. After about 10 days in Laos we will be arriving in Siem Reap by air on June 30, so I will no doubt get our Cambodian visas at that time. Our plan now is to travel from Siem Reap back to Bangkok overland via taxis, as I am hearing some negative stories about buses. My question is; Will the Thai visa I possess from my initial landing on the June 20th be valid for the border crossing back into Thailand on July 5th? If so, is there a fast track line we can use or will I have to suck it up and wait for hours?