A side business is really not that bad. Having a limited amount of time every day to work on something or even just having a few days a week to work on something really focuses your energy… When you have 10 hours per week, those really matter. You can’t screw around with ten hours; then nothing gets done that week. Having less time is really a huge benefit to most people because if you have all the time in the world…you’re going to spend your time or waste your time on frivolous features that you don’t need anyway.

—David Heinemeier Hansson, Ruby on Rails creator and 37signals partner