At which land crossings? I'm planning on crossing the friendship bridge and to Vientiane, staying 7-12 days, then returning for another 60+30. It will be my first time exiting and returning after my initial 60+30. Never been to Thailand prior.
After that 90, I was planning to return to the US for 6-8 weeks, then probably do Vietnam, Cambodia, etc... for a few months before attempting to re-enter Thailand, probably on a different visa by then.