Just received my 30 day (non-Covid) extension on my multiple entry 60 day tourist visa at Chaengwattana immigration centre, Bangkok. 2.5 hours queuing from 14.00 to 1700h. All done and back in the taxi at 1715h.. in time for rush hour. Sabaai sabaai.
TLDR : Answer Summary
The post describes a successful experience of obtaining a 30-day extension on a multiple-entry 60-day tourist visa at the Chaengwattana immigration center in Bangkok, including details on the queuing time and process. A comment follows questioning the timing of the visit and whether an appointment was made prior.