I traveled to Poipet, Cambodia for a border run today. I drove there with my wife and friends who stayed on the Thailand side. Arrived at 1:00 pm. It took about 2 hours from exiting Thailand to entering Thailand. The only complication was exiting Cambodia, the Customs Agent wouldn’t stamp my passport until I talked to the Customs Officer at a nearby desk. He simply warned me that if Thailand doesn’t let me back in, then I could have a problem . I thanked him, got my stamp and proceeded to Thailand Immigration without any issue.