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From the experience I've had working with family people, I've found an amazing ability to get stuff done when the objectives are reasonably clear, the work appears to have meaning, and if it can be done within the scope of what should constitute a work week. When there are real constraints on your time, like you have to pickup the kids or make them dinner or put them to bed it appears to bring a serenity of focus to the specific hours dedicated to work.

Constrain is indeed helpful. It makes you better at managing your time, and your tasks.