Hi Marvin, I imagine it will be hard to do in one day from HH unless you fly somwhere from BKK. Can I ask where you lodged your application? I am about to do mine.
you mean in Vietnam or returning. Both were fine. We left again recently at about 45 days into our second 60 day stay to attend a conference in a neighbouring country and came back 5 days later and got a new 60 day stamp but we are leaving after 35 days anyway so not issue. The immigration person on return into BKK did ask when we were leaving but that was all. We are going to apply for the DTV next time we leave