When I was younger I used to read much more quickly. I also was reading smaller books (I cut my teeth on Harlequins
) I used to read a book every day or day and a half. Now I usually read a book every two or three days so finish 2-4 books a week.
Usually I read two or three books at a time. I am currently reading three: one for church which I have to review, A Room with a View for the MR book club (that's a re-read for me so should be a little quicker) and the second Harry Potter book (I'm re-reading the series).
I read on the bus. That's a good 60 to 90 minutes of reading every day. Since I got my e-reader that's what I take on the bus which means my pleasure reading goes quicker. The church book will probably take the longest just because I keep putting it down. Also I can't find an electronic copy of it at my library to take on my commute.
Once I get into it it shouldn't take long to finish (a week or so at most).