Crime and Punishment is a fabulous book. I recommend reading it in chunks at a time to really appreciate it. It isn't a book you can just read a couple of pages then pick it up again a few days later and follow easily.
I've just been reading a bit of Tolstoy's War and Peace but couldn't really get into it. Admittedly I was trying to read 3 other books at the same time which doesn't help. My bedside table is piled with half-read books.
I usually have to read a book in one sitting or else I never finish it. I've tried the piecemeal method, but it just results in half-finished books. I don't always finish it in one sitting, but 2 or 3 at most.