I’m with NinetyWt and the other hermits on this one… Aside from work, where few people come by and talk to me anyway, I spend nearly all of my time alone. I hardly even go out, usually because I end up having a worse time than if I’d stayed home. It also doesn’t help that most of my interests are not group activites.
But is that what you’re asking about, or how much time we have with nothing to do? I can usually find something to occupy my time, even if it’s just watching a movie or playing computer games. It just happens that I’m always alone doing it.