1) If the book is fascinating enough and if I've got time I read all of it in one sitting, but that happens only once every two months. At the moment I try to restrict myself and read not more than one chapter a day.
2) Currently, it's only one (Not counting Mathematical school books and Cicero's Pro Ligario, which is also for school) 2b) Um... Two at my parent's, one for the bathroom, one in my bag, and two in my bed - That would be six.
3) I read almost everywhere, though I try and find ways to prop up my feet. 3b) I love reading while sitting on my bed, back to the wall.
4) I prefer silence, but I tend to forget the world around me, so usually I don't mind. (My roommate at uni would call me at least three times before she would get a reaction. Sometimes she prodded me or threw something at me) 5) I like to lean back on something and have my feet not lower than my bottom. (So, if I'm sitting on a chair I'll and put them on another one.)
6) I don't regard Math or Latin texts the same way as other books, so I'd say I only read for pleasure. 7) yes: eating, watching movies, planning my lessons...
8) I do all of them. I try not to dog ear, that's why I have a collection of old tickets for book marks. If I leave the book for only a few minutes, I turn it cover side up.