I just copied the explanation from
@T**
in another topic: Tod DanielsGroup Admin If you're talking about an ED visa for studying at a private school in Bangkok you can get only 15 months of total study.
You enroll, get paperwork go to a thai consulate and get a 90 day ED visa. Then you get 60 day extensions at the immigration office until you hit the 8th month.
Then you go back out of the country and get another single entry ED visa and you can get 60 day extensions on that until you hit the 7th month. Then you're done and need to study another language.
The days of 4 hours a week on an ED visa are long gone. If you enroll for a year program you must attend 10 hours a week and if you enroll for 6 months you must do 8 hours a week.
This all happened because of a few visa mill schools selling ED visas rather than making sure people were studying.