Hiya!
Novel? Easily a month or three.
Rule book? A few hours to a 'day' (say, 7 hours).
Why? With rules, I'm reading them and absorbing the info. I'm reading it as myself, trying to keep things in my brain and extrapolating likely scenarios using said rules.
With novels though...I read them "in real time", with voices from the characters, inflections, and I let my imagination fill in the scene and nuances.
Rule: "Dwarves get +1 to hit against Giants". A 3 second read, tops. Easy. Simple. Got it. That's how I read it; I picture a dwarf fighting a hill giant and picture the dwarf getting up close to the giant so that the giant has to look straight down at his feet, and the dwarf can move to the side or try and get behind the giant. Easy peasy.
Novel: "Dwarves? I once saw a dwarven Hammerer single handedly take down a giant from Stony Hills!". I read it as I picture the character speaking it...with pauses and inflections. So about 10 seconds to read, maybe 11 or 12. I pause and picture the speaker sitting at the table at the inn, leaning back in his chair with a wry smile after mentioning Dwarves, as the barmaid carefully makes her way past him carrying a tray of beverages. The crackle of the hearth fire in the background. The speaker reaches for a pipe on the table before continuing with the "I once saw..." part of the line. Sparking up the pipe between "Hammerer" and "single", taking a couple puffs before finishing.
So, yeah. I read novels... "oddly", I've been told. I find the novels my friends read different from the novels I read.... even if we read the exact same novel.
^_^
Paul L. Ming