I picked up my LTRWP Visa in Bangkok yesterday. My timeline:
November 12 - Applied for Visa
November 30 - Notified of approval
December 7 - Made appointment for December 14
December 14 - Travelled from Hua Hin to Bangkok and obtained Visa.
I was surprised at how fast this went, but to clarify some things, my application was pretty straightforward. I am American. My income was a mix of two pensions, Social Security, and farmland that is cash rented. I also used a cash position in a high yield savings account at a bank in lieu of a health insurance policy.
So, I think it was easy for the analyst at BOI to verify everything, thus the reason for the speedy approval.
I did ask about the annual reporting that has to be done and I wouldn't be optimistic that anything will change, thus a annual trip to Bangkok will be necessary if you don't leave the country during the year.