This reminds me a bit too much of another engineering story. Worth the 5 minute read:
Institutional memory & reverse smuggling https://landley.net/history/mirror/institutional_memory.html
In total, probably 8-10 hours a week.
I work full time and live alone. So I lose 40+ hours on the front end, plus most nights & weekends doing all the chores that go along with being a functional adult. Recently, I also added working out into my routine, and that pretty much broke me. Yes, there’s enough time to survive, but ya reach a point where you wonder WTF - how come I never have any fun anymore? I’ve now reached the point where I’ve had to force free time into the schedule. I now purposely fuck off Wednesday nights & Saturday mornings. Everything else is full. =(
Related, you might enjoy the moving Born Rich. It’s made by a rich kid & it’s about what their life is like growing up. It’s not a good movie, but it was interesting.