Does anyone know of a few good long stories to get lost in?

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I love science fiction and fantasy and can get lost in stories for days if they are good enough, but I have been having trouble finding another book. The last long story I read was Somewhere Else Entirely, but since then, I've been going from novel to novel about once a day. It's certainly a craving of mine and one I happily submit to.

Do any of you have books that you get lost in for days on end or know of novels that are of that length?

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I was amazed by all the responses to my blog. Thank you for your comments on what good long stories there are on the website and elsewhere; I'm sure I and hopefully others will be busy minding our ways through these stories for the next little while!
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