Took me 6-8 hours I believe, not counting the time I spent dicking around and drinking beer. I like to take my time on stuff though, make sure I'm not screwing shit up. Sometimes you just take more apart than you have to, but don't realize until it's apart..
Digging into something blindly will always take a lot longer, I could probably do it realistically in 5-6 hours now that I know how it goes.
Fuel lines do not need removed, but that's up to you. I am better at installing injectors than I am at the fuel lines themselves (I feel safer about it anyway).
I don't believe any accessories will need removed (maybe A/C?). Water is going to go everywhere in the lifter valley once the old intake is lifted out - you will need to change oil after the fact.
Other than that it's strait forward; use torque wrench and proper sequence on the lower intake and you should be good. That's the critical part, absolutely make sure that gasket is right.
Pete