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Your over thinking it. Play as little or as much as you want. If it feels like work stop. Its meant to be fun. The 10 minute rule is just to trick you into getting started then the next thing you know an hour went by. If it was the one hour rule you would either dread it or never seem to find the time. The whole point is just do it. Any amount of time is better than nothing. There is really no point to timing it unless your forcing yourself to practice which is wrong.