Would I be right is saying my 6 month multi entry tourist visa gets a 2 month stamp on arrival Then I can get and extention for 30 days. When that 30 days is up if I do a visa run it is stamped in for another two months and can get a 30 day extention. Is that how it works

Australian multi entry 6 month tourist visa from is what I am holding.

Or is it some other configuration.

Hello. I have a 6 month multiple entry tourist visa which expires on the 12th March 2020. I want to stay until the 26th March. Am i right to assume that as long as i do my final visa run and arrive back in thailand (by plane) i will get another 60 days ?. Thanks. David