Wyn Williams. For as long as you stay in Thailand on a retirement visa, you will need the 800k in the bank every year when you apply for an extension. Yes, you can withdraw 400k three months after application, but you still have to replenish it two months before the next application. It stays in the bank until (1) you leave Thailand (2) you die. As long as you're in Thailand you cannot effectively touch it. That is why I favour the 65k/month method. You can spend it as soon as it hits your account
Kev El Chino Isaac. There's a range of different stories varying from complete non-delivery to excellent fast delivery. It seems to be luck of the draw. My philosophy is if it's not that important don't send it
If you came in on an STV you should have been stamped in for 90 days including the date of arrival. It might be that immigration made a mistake when you entered and stamped you in for 60 days. Although it's their error, it's equally yours as you should check all stamps at the time. I suggest go to the immigration office and explain what has happened. You MIGHT get away with it, or you might not. Otherwise you're up for 500 baht/day.
Sam Lin. I wouldn't advise sending the post version and then doing it online. Thai immigration is very anal, and it's possible both will be rejected. It's best to do it the other way. Try online first 15 days out. If it doesn't work, then post it, and forget about it. Although immigration website says 15 days out you have to post, I've done it twice at 14 days and both times it's been fine. EMS tracking is a MUST