This is very real. The time adds up and it's often not the best way to relax/learn. Not only you could spend this time being productive, you could also just be resting or sleeping or just reflecting on your life.

You might want to check out https://watchlimits.com/ (free extension, I built this), or some other tools I mention in https://watchlimits.com/blog/posts/more_hours_per_week/