Classes meet on Tuesday and Thursday evenings from 6:00 - 8:30 pm.
There are usually two (or three) levels of proficiency:

Time/Class	Lower Level	Upper Level
6:00 - 7:20	Grammar & Reading Teacher A	Grammar & Reading Teacher B
7:10 - 7:20	Break
7:20 - 8:30	Listening & Speaking Teacher A	Listening & Speaking Teacher B