It's easy to speed read technical material, especially with the benefit of 50 years of doing it--I simply look for the new material that is inevitably mixed with lots of introductory or background material; I really can't read fiction any faster than my normal relaxed, rather ordinary reading speed. Fiction can take so many twists and turns that it's not possible to dash through it without reading every paragraph.
Recently, I've been thinking about revisiting the subject of my undergrad degrees, Mathematics. I just don't know if I really have time in my life to go back and relearn Topology for example. I didn't appreciated (nor respect) it enough to learn it well when I took Topology 45 years ago, now I wish I recalled it.
It's sobering to consider how few kilo-days I've got left. :(