They changed the regulation already so I not sure if there is any cap currently. But if someone always max their visa ememption per trip you think immigration wont ask de meh???
Beyond 90 Days
A dose of good news awaits tourists—following the new regulation set by Thai Immigration, visitors can now come regularly to Thailand without limiting their stay within a total of 90 days in a six-month period.
However, immigration officials still recommend getting visas prior to arrival in Thailand, as they remind visitors that back-to-back short visas are not the proper way to extend the stay in the country on a long-term basis.