@Barry *****
, actually that's mis-information put out by one of the schools :(
It's got nothing to do with how many days you're outside of thailand on. :/
Unless I'm mistaken you can't get a Certificate of Entry from the Ministry of Foreign Affairs office to get back IN to thailand if you're enrolled in a private language schools or muay thai school or self defense school or under water basket weaving school
ONLY real uni students and international school students can request entry to thailand at this point in time
The only private language school that can get people in right now is the one run out of the Chiang Mai University campus because even though it's a private school it's run ON the uni grounds