Will I receive a 30 or 60 day stamp after a border bounce with a 6 month multi entry tourist visa at Mae Sot?

Here's an example this visa is good for unlimited entries right up until 11:59PM on Feb 14th 2020 (valentines day). As long as the holder of that visa stamps in on or before that date they'll get another 60 day entry stamp

You're also confused about how the procedure at Mae Sai works. You can't even stamp OUT of thailand if you can't stamp back in because you don't get a VISA to burma, you just pay 500 baht to stamp in and out (day pass). When you go to stamp back into thailand as long as your 6 month METV is still valid you will get another 60 day entry stamp.

@Dennis ********

, alright, lets get this sorted..

You hold a 6 month METV and that visa is valid for unlimited entries to thailand during the 6 months it's good for.

It has NOTHING to do with your current entry stamp's expiration date and everything to do with when the VISA itself expires. So look on your visa, see the issue date and the "valid until" date. As long as you enter the country ON or before that "valid until date" you'll get stamped in for 60 days

with a METV you can theoretically get 8 months out of it, doing a border run just before it becomes invalid, which will be 6 + 2 months. After this you could still do another border run and enter with 30 day visa exempt, which you can extend on Immigration inside Thailand for 30 more days for 1900 THB. Giving you almost 10 months of stay

check the date on your visa sticker on how long it is valid for re-entries

as long as you are within the validity period of your Multi Entry Tourist visa, each entry will give you 60 more days admitted stay

60 i would have thought!