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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I'd say an hour or less, on average. When I'm fairly immersed in a book, I'll read up to several hours a day for several days, until I finish. If it's a totally new book, I'll probably end up reading it within one or two days, doing nothing else.