If they don't take a good bit of time to read, then you're not doing it right. These are books full of tools for the mind. The best way to read them is a little at a time, taking the parts that click in your mind and trying them out on problems that seemed insurmountable before. The first time you open a big box of strange tools, it won't be immediately apparent to you what they are all for. Finding a good math book…
Thanks, I needed to know this. I was starting to feel silly, thinking "maybe I don't understand them quick enough, people must read them faster or something".