Every person is different and vary in time and concentration management. If you have a single income stream with a lot of dependencies, it's extremely risky to

Every person is different and vary in time and concentration management. If you have a single income stream with a lot of dependencies, it's extremely risky to even distract yourself with wishful startup ideas. The most useful advice would be to get your life/money/time in order first. The worst thing that could happen to a side project is when wife/kids/bills start complaining nonstop for attention! Google has a 20% rule which could work for those who have managed to find clean time gaps in weekly schedule to work on side projects. But never commit full-time to an idea or half baked product until it matches most of your previous income with an upside potential that truly requires your dedication. ie. don't quit your job until you can fully pay yourself from the new business!