[TechieTeach]

That's a large amount of time but there is one advantage to that — lots of chance for exposure. It sounds like they want the kid to learn fairly 'naturally' through playing etc. This doesn't work too well if you're only teaching a few hours a week - but in your case it works out well. Make sure there are a lot of exposure activities like: playing in English, reading books in English together, watching TV programs together in English (and talking about them), singing English songs together.