@Stephen *****
it appears to be a 60 day visa exempt with a 30 day extension. You may at a later date enter with another 60 day visa exempt with a 7 day extension. Either that or it's a 60+30+7, I'm not sure yet. Should know more tomorrow. It appears they are stopping same day land border bounces. Maybe catch a train to Laos for a few days and try for another 60 day visa exempt to make sure.