The work may be easy, I mean if you just follow a textbook and don't have to prepare lessons.

Still, the 20-25 classes a week seems crazy. As there is a huge shortage of FT's in China right now ( thousands and thousands have left and leaving or planning to leave ) you should be able to negotiate a good deal.

If you plan to stay in China the least you should do is squeeze every dollar out of those lying and cheating Chinese fuckers.