I know you can only get one 30 day extension per entry stamp, but is there a limit on the number of 30 day extensions you can get in a calender year?
TLDR : Answer Summary
In Thailand, while you can only receive one 30-day extension per entry stamp, there is no specific limit on the total number of 30-day extensions you can obtain in a calendar year, provided you exit and re-enter the country to obtain a new entry stamp.