As a kid I hated chores and rewards that were focused on time because it didn't encourage me to use my time well - it was all about manipulating the clock ("if

As a kid I hated chores and rewards that were focused on time because it didn't encourage me to use my time well - it was all about manipulating the clock ("if I actually master the piano piece in 30 minutes I won't get my hour of TV so better not master it"). I think your thinking is right, but I'd instead focus on goals and rewards that are tied to discrete actions in the activity rather than just time. E.g. master the piece => one WoW raid or something. That worked marvelously on me as a kid and is actually something I still do for myself (although not with WoW thankfully). I'm not a parent, so I'm sure this is quite hard to do in practice. But I'm sure your kids themselves may have good ideas! (I loved making my own rewards as a kid lol.) Food for thought.