for the initial visa yes, I used agoda and prepaid and then canceled during the 2 week quarantine at the time and found a condo to lease. On the extention in bkk they accepted lease only with no proof of payment.
Please join the attached the group. They can help you with requirements to get out philippines... Which is much hard than getting into Thailand. You will like need to complete CFO, and will need authenticated AOS from your boyfriend, plus a stack of evidence of who you both are and your relationship.
You probably misunderstood. The 60 days is for valid of entry, meaning you must enter from 60 days from the date of issue. When you enter you will get 90 days. If you do not enter within 60 days (dates are listed on the visa) the visa is void.
As far as how long it takes it will very based on the embassy and how busy they are. I did a STV last year in Taipei and it took 1 day, but that's probably not that common.