How Long is Too Long?

Yesterday I posted on Facebook that I had finished the first draft of my new Lady Georgie book and felt it was a little long, so the next step was to bring out the axe. I was surprised this morning to see a whole lot of replies saying "please don't cut it. We want your books to be as long as possible." Some were kind enough to add, 'we don't want them to end." but others added, "We love long books."
So now I'm curious--do you love long books? Do you select books based on length? Are you turned off by big fat books or do you look forward to staying with them for a while? Is there a certain length that mysteries should be? (mine are usually around 300 pages. The Molly Murphy series goes a little longer, closer to 400 sometimes). I'm actually re-reading the last Harry Potter book at the moment--as a sort of wind-down after all the frantic activity in my life this month and I have to say I am not finding the 700 pages to be a chore. it's nice to see, when I pick it up, that there are still a few hundred pages to go.


And of course with my new Kindle the question of the weight of a 700 page book is removed from the equation, isn't it? I can read War and Peace, holding it in one hand!! And speaking of weight--the thinness and lightness of Kindle was one of the factors in deciding to go with it over the iPad or even the Nook. But now I think I should get a case for it and you know what? The cases are heavy. Does that make sense? Can anyone suggest a light little sleeve that keeps out dust but doesn't turn my Kindle into a clunky object?