Jimmy Enslashay
I think I could have a crack at Vice City. I finished the storyline mission the other day in a few hours without trying too hard. Still, very fast times. 7 hours for San Andreas? Damn! Same goes for GTA III. I thought that would take longer than Vice City. Does this include side missions that aren't required for storyline completion, like The Haitians and Cubans missions, etc? I assume you don't have to do them, but I thought I'd check.
Those are not required-- here is what is--
Ken-- All
Cortez-- all except his last one (all hands on deck)
Diaz-- All
Vercetti-- All
Businesses-- 6 (its fastest to NOT DO Malibu and Film Studio)--these missions are the longest IMO but I bet it might be possible to do the film studio fairly fast and maybe knock off one of the others-- would have to test it out. THe only business you have to do is printworks.
Final missions All (both)
Avery is not required, but there is a point where you finish a mission for Ken and it opens up Avery's missions-- his will be the only icon on the screen until you exit the vehicle for about 15-20 seconds-- then you get a call from Cortez opening up another-- if you don't exit the vehicle and wait or enter the Avery marker before the phone rings-- you may think Avery's are required (they are not).
Avery's missions open up Cuban and Cuban open up Haitian-- I think Shakedown opens up love fist and love fist opens up Mitch Baker missions. Malibu opens up Phil Missions..... so all these are side missions.
I did (and so did that guy) the cone crazy money trick to get enough money to buy everthing.
For III-- I imagine you could knock off alot of missions by avoiding some--by doing sayanora Salvatore you can lock yourself out of several as well as the Kenji hit for Ray before doing all of Kenji missions-- there is more I believe...
I haven't really looked at the SA mission structure, so haven't a real good idea of what is required and not.
I think the key for all of them is not dying and having to restock weapons and of course not having to redo missions-- these guys were very selective in saving.