Hello all. First off i've just managed a successful border bounce at Mae Sai going from one 30 day visa exempt to another with no problems in case anyone is unsure about the possibility of doing this. No outward ticket required, no proof of finances asked for, no passport photos or application forms. $10 or 500bht payable to Myanmar immigration. I'm not sure how late in the day you can do this but i crossed at 7.30pm and was told to come back through immigration by 8pm so i just turned straight around and re-entered Thailand.

Now my question is can i now go to immigration in Chiang Mai tomorrow and have my current 30 day visa exemption extended for another 30 days past it's date of expiry having only just got it yesterday? Or do i have to wait until closer to the time?