<-- ...HOLiC
I have a horrible tendency to watch only one series, five to ten eps at a time until its done. HSD: Kenichi in 6 days (four of which were my days off and I was too sick to do much else) Spice and Wolf in three days (while I was working... really tired at work lol) I think I finished CG (+ R2) in under two weeks.
Yes, the same thing happens when I'm really into a book or a manga. A typical GREAT book (I don't like 'good' books haha) is read in about three days or less. When I start reading manga I end up taking a break to get a drink and noticing I have to go to work in a few hours!