Posted by: Voodoo Soup
On normal, you can generally beat it in a day if you've played before. As for Legendary... it took me a week or two. Difficult stuff, but I recommend that you complete the intro until you find the first clue. When you play that mission, wait until you get back to the Mombasa streets, save and quit, and reload the next mission. i.e. Play "Prepare to Drop", find Dare's helmet in the monitor, play "Tayari Plaza", finish on Mombasa streets, Save & Quit, Load up "Uplift Reserve".
I hope that helps. Saved me time.
But that takes away the point of the game!
(unless you've already beaten it, in which case this is fine)
If it's your first run, I recommend you play it through.