“I split this three ways with these two other guys. I just give them the features and the notes and my vision. I probably spend 5 hours, 10 hours a week maximum on this project.”

Spend 5–10 hours a week max — design the side project to scale without you

A side project doesn't have to consume nights and weekends if you give the build to two partners on a clean equity split and keep your role to vision plus feature notes. The business compounds without you, which is the whole point of a side project.