Hi, this might help anyone going to the Samut Prakan immigration office for a one-year extension based on retirement (probably an extension based on marriage too)
Without using an agent, which I never do, I got the one year retirement extension plus multiple re-entry permit in about 80 minutes yesterday. The process was very smooth and would've been even quicker had I not had to validate a screenshot of the TM30 on the second floor. The TM30 screenshot (from the online website) is important to the Samut Prakan office and you also need it for the re-entry permit, so make TWO copies. When you order your bank letter, get the bank to give you a 12-month printout of all your transactions (that was 20 pages for me) The Samut Prakan office really like those printouts and I got a thumbs up from the officer yesterday. The office wasn't that busy on a Thursday morning either.