Peter"s grasp of English is correct. You are wrong. "not earlier than 72 hours before arrival" means exactly what you should do: if you filled out the TDAC as "early" as 94 hours, 80 hours, 75 hours etc. etc. before arrival, the TDAC system won't accept it. That's why the TDAC should not be filled out "earlier than 72 hours before arrival". And of course you also can fill out the TDAC "later than 72 hours before arrival", which would mean any time between 0 and 72 hours before arrival . . your problem seems to arise from ignoring the negation
yes, only your "main" branch is going to issue the letter. If you move to a different location, you need to establish your new residence at the local branch. It can be done with a "certificate of residence" from Immigration
if you are a U.S. citizen, you can apply for the 90-days Non-Imm-O visa in your home country using monthly income. But for the application to the extension of the 90 days stay permit to a 1-year stay permit based on retirement, you will need a minimum of 800,000 THB in a Thai bank account in your sole name, seasoned for 2 months, at least for the first year extension of the stay permit. Because your embassy in Thailand will not issue an affidavit of income for Thai Immigration . . . .only for the second year, after having collected 12 monthly transfers of a minimum of 65,000 THB with proof they have been sent from abroad, month for month, confirmed by a 12-months Thai bank statement, Immigration is willing to issue the 1-year Extension of Stay Permit using monthly income
Pang Pang Pang . . keep in mind, for the application to the one-year extension of the 90-days stay permit based on marriage, on Immigration, you will need a freshly printed marriage registry printout from the Amphur, the Kor Ror 22 or 2 (whichever applies). The original "rose bordered marriage certificate" is irrelevant on immigration, because you theoretically could be long divorced and still use this old document to prove a non-existing marriage
to obtain a "certificate of residence" from Immigration, the minimum requirement is that you need to be registered in your accomodation by the TM30 online system registration. If a hostel stay counts as a valid reason, this is up to the decision of the Immigration official. So if they refuse, you still can try your luck with an agency. In Pattaya, it is relatively easy with a service from an agent to get your IDP converted to a Thai driving license, regardless where you stay
that solely depends on your stamp history of the past 365 days. . . of course you will be pulled aside if you have an extensive tourist and visa-exempt entry history. . . . You can get a METV every (!!) year and enjoy a minimum of 6 months in Thailand on this visa every (!!) year without ever been asked at the borders when doing a border bounce