Assume you WFH, 9 to 5. Commute time is zero. You have a middle class suburban house with a lake in the back. Your partner is a stay at home parent, does not work, just does household tasks and takes care of kids.

You wake up at 7. Quick 15 minute breakfast then push your kayak out to the lake and row 45 minutes on the water.

From 8 to 9, you can study a foreign language (same duration as a university course)

At 5 you can game for an hour and decompress. Then ping pong at 6.

By the time you finish ping pong with kids at 6:30, you’ve spent 90 minutes just playing around. Time for dinner, prepared by your partner. Kids have 25 minutes to get dress for soccer and eat dinner. The soccer field should be no more than 5 minute drive from your home.

After the game ends at 8:30, you could schedule an additional 20 minutes for your children’s frivolity if you like. Once you drive home you can cut down to 30 minutes working on open source stuff. A small sacrifice for their joy.

Send kids to their rooms by 9:30. Let them sleep whenever they feel like as long as they are quiet and in their room. Spend time with your partner and prepare yourselves for the night out.

By 9:45 the baby sitter arrives and you two head out for the movies. A baby sitter can be very cheap if your kids are older, often they are just a high school student doing homework or watching TV while your kids sleep or play. Don’t need a PHD.

You could be home by 1 AM depending on movie length. 6 hours of sleep is good enough, you can do it all again the next day.

It’s very doable, especially if you decide you don’t actually want to follow the same schedule everyday.