if you apply for the 60 day visa, you will be asked for an paid on going flight etc. it's on their e-visa site itself. If you get a Visa on arrival, then you probably don't need it.
maybe bus from Siem Reap, get 30 days on arrival, extend for 30 days. Then fly out and back, get another 30 days and extend for 30 days again. Finally do another land border run.
thanks. So, I can take a flight out every 60 days, stay out of Thailand for about 5 days, and return to Thailand? I know you said there's no limit, but can I safely do this for about three times. For a total of 180 days? I'm trying to figure out if I should get a condo in Bangkok for six months.