You can’t stay 85 days because it’s a 60 day visa. If you go on day one you get 60 days on arrival. If you go on day 90 you still get 60 days. It’s a 60 day visa valid for entry upto 90 days after issue. How do you not understand ? If you arrive on day 90 your visa is activated for 60 days. So it’s just started. Not been fulfilled until your 60 days have expired
I don’t know about a non b.
But I do know a non O visa is a 90 day visa. Mine. I can then extend it for a year. So it becomes a 1 year visa.
It’s not what you think it is. You’re wrong. Yes you get to use it within 90 days of it being issued. But you’re only ever allowed 60 days in Thailand. You could actually get stamped in on day 90 for 60 days. So does that make its 150 day visa? It’s a 60 day TR visa. Just you making shit up doesn’t mean it’s a fact. Learn to read correctly. No such thing as a 90 day single visa.