I intended to buy a TR 60 days to enter Thailand, then change to non o under retirement. I read here that, need to apply it at immigration not less than 15 days before visa expired. Some advise that, not less than 20 days before visa expired, for some immigration office.
But I would like to know, is there any rule that we cannot do the above change of visa more than certain days before the visa expired? (Especially if it was applied in Pattaya immigration)
(I wanna to apply the above at the immigration earlier, said 45 days before TR visa expired. Because I worry that there will be any delay due to different requirements from the immigration that I have to prepare new document to reapply it)