I've got in the habit of reading around two hours a day. I mostly read about astronomy and science in general.
The books i'm currently reading are Beginning Chemistry and The Handy Astronomy Answer Book. And a couple of math books.
How about you?
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When I read, I lose track of time. It could be 10 minutes, it could be 2 hours, or even more. It solely depends on how absorbed I am into a book. But if I read a book from cover to cover, start when the sun is out and end when the moon is out, then I know I've read way too long.