Normally if you resign with specific date, you must leave country within 7 days, you also need cancel your WP (your company might do it) and visa. If you don't do it, you will have issue next time you apply any visa, fine 20.000 THB. Also, you will end up in overstay which is really better to avoid. I recently left my job and I asked my layer to help me as I wanted make sure all will be cleared correctly

@เดวิด ******

for now now they don't use TM6 anymore

If you already have visa then you ok, no need other document

Last time I did it took 5 days, the time before only few hours... I don't know why, but been approved each time

Put the last one you had (even if it was from months ago), this is what I did and it worked

As long as you did report 1 time in person you can do online after, even if you left country and came back

@Graham *****

Ok, thank you!!, I heard many issues about Poi Pet in past weeks, so I will use other border point

I'm French, sorry I should have mentioned it

be carefull, i also thought i could use old passport with visa, it is the case for some countries, but in Thailand visa must be transfered to the new passport