How does the Multi-Entry Tourist Visa (METV) work for extending my stay in Thailand?

Juile your Visa is valid for six months. That's means you can enter and exit (theoretically) as many times as you want in that six months. Each time you enter, you're allowed to stay for 60 days without going to immigration for a 30 day extension.

After 90 days you have to leave, no matter what, even though your Visa is still valid. Leave, come back for another 60 day stamp, extend again, and just before the date of your VISA expiration (not your entry stamp expiration) for another 60 days. At this point it's almost 8 months, and you can get a final 30 day extension on your entry stamp making it about 9 months.

Confusing, but not really

@Julie ********

how are you figuring 9 months only leaving one time 60+30 is 90 days 3 months then to leave and 60 days +30 that’s 6 months you’ll need to leave on more time

Julie Fischer you can come and go as many times as you want, up until the last day on the visa. Each time you enter, you'll be stamped in for 60 days. So if you enter the day before the visa expires, you'll get another 60 days. Drawing out the time you can stay in Thailand to around 9 months if you extend the final entry at immigration by 30 days.