It does take a lot of energy. People often are surprised I can do it, and say “ah you must not have kids”. Which is true, I don’t have kids.
And I know that having kids means devoting a significant amount of your attention to them.
Still, I feel like I will continue to crank out new projects even once I have kids. I’m sure my time spent on those projects would drop, but I doubt I’d stop entirely.
I have friends who have no kids who don’t work on projects like I do. I think some people are just wired to churn and others aren’t. I have a friend who struggles to get much done on weekends, while I am kind of non stop moving. I think it’s a personality thing.