Re: Your headline reminds me...
Ask yourself "How many spare hours would I have if I didn't watch telly, and I didn't play video games?". If you're a normal, modern human it probably adds up to over 1500 hours per year. Half a century or so adds up to 75,000 hours. One can accomplish an awful lot in 75,000 hours. (Obsessing over various local Sports teams can easily add another several thousand hours to this figure, as can religious activities, etc. etc.)
Next, throw in the fact that I cheat ... When I was in high school, I discovered that I got by just fine on 4 hours sleep per night (swotting for O-levels while still maintaining time for drinking playing rock & roll demanded it). I've since discovered that I do even better on 3 hours sleep per night and a one hour siesta after lunch. After around 50 years, that's another 75,000 hours ... assuming a so-called "standard" eight hours of sleep per night.
I've spent the spare time[0] pursuing things that I find interesting, fun, and satisfying.
What are you doing this fine Sunday afternoon?
[0] It's not actually "spare time", we only have a finite amount, use it wisely.