Ten is too young, I think. I also don't think it's something you can push externally, unless you want to stigmatize the activity and ensure that it is treated as a chore; like piano practice, or ballet dancing.
BTW now that she is beyond the initial wall, after about 3-4 months 30 minutes per day, she is enjoying making games and coming up with her own ideas. It is amazing how much you can do with just lists :)
Altough, maybe not yet.