I'm not sure it's bad to feel guilty about this. I'm more interested how people who don't feel guilty see life. I mean surely at some point having aimless fun starts looking a bit like wasted time in someone's life, no?
We live to give our tiny contribution to humanity, and we do it by creating something through work. That also brings joy, and we do it to help each other (deviations notwithstanding). But it's a meaningful joy.
If I'd work 16 hours a week all my life, I'd have some serious regrets on my death bed.
I'm very happy to see people working 16-25 hour work weeks, and it's probably very good for their personal life.
Just one question, don't you feel guilty going like that? I'd feel guilty, as if life gave me this time to get as much work done as I can, and I just don't.
So it's about finding one's balance. If someone's balance is 16 hours a week, so be it. I just find it a bit unlikely though.