BS, that all depends on several factors.
For drifting, if there's only one person in the boat I'm going to say a max of 3 rods before things just get too complicated.
If you got a buddy - and he has to be a fairly decent 1st mate - then you can comfortably fish 5 or six rods.
Now, if you're trollin - you better go with one rod per person, unless you've been blessed with a nice soft unobstructed sandy bottom. Making sure bait stays on and fresh, re-tying the ones that break, etc. are going to make thing less than enjoyable the more rod you have to worry about.
Just my .02.
Blue