How many in country extensions allowed ?

Hi
question…
I did a visa run from Chiang Maito Mae Sal on January 2first
Recvd 30 days.
ExpiredFeb 19
Extended on Feb 17
Recvd 30 days.
Expired March 18
Did a visa run on
March 16
Recvd 30 days
Will expire on
April 14
My question is :
Prior to April 14th
can Iapply for another 30 day extension here in Chiang Mai?
(i realize this would be the last one )
But Im not sure how many in country extensions are allowed in one calender year.
Thank You