For me, I'm happy that I invested my time into myself, rather than investing money into some mutual funds or something. Very happy.
20 hour work weeks don't usually lead to more life experiences, in my experience. You just have more time to focus on side-projects or hobbies. You'll still be 'working' 40+ hour weeks, but dividing your time between different projects.
As someone commented before, if he wanted experiences, then he should take a few months of unpaid leave of absence, and go exploring the world.
Um, right, by focusing on side-projects and hobbies, you get more life experiences is the idea. Certainly you get more diverse life experiences.