Is it a problem to be away from Thailand for over a month on an ED visa?

The user is concerned about returning to the US over the holidays while on an ED visa in Bangkok, specifically about being outside Thailand for an extended period from December 7 to January 4. They are applying for a re-entry stamp and are uncertain if their prolonged absence will affect their visa status or school attendance requirements. Responses indicate that regular attendance is important for visa renewal, and while there is no clear maximum time outside the country mentioned, it could raise flags for immigration if there are attendance issues.