You write "you guess" but you need to know! Why? Its much easier to handle a problem if you know! They did this to me one time. They just say -go away from Thailand! I have no problem before and im look like an ordinarie boring person. I did go back next day, no problem!!!!??
Had lek border have changed to just two, but my friend have done visa runs soon two years to vientienne Laos. 60+30 days. Don't pay people at the border to help you with paperwork out from Thailand and into Laos. And for visa back to Thailand it's really easy,! Have photos and copies of every stamp in your passport.