the main bones happen in around 8hrs. Structural process takes around 4hrs. Fine tweaking and automation 4hrs. Quality process (glitches, random stuff etc) 2hrs.
Leave it a couple of days. go back and listen with fresh ears - make adjusments as necessary, 4hrs
Bouncedown and testing on various systems, 2-3days depending on which of my mates will let me test out on their hi-fi's/PA
Remaster according to test findings..
Burn and offer up....
I know that sounds a bit scientific, but thats hows i's does it's