At least 800 mil. 1 bil would be a safer amount to earn, as that the highest it could go, and if I don't need it all, I'm sure that you can find some use for the money:)
One quick question that hopefully someone who's experienced at this -looks at Nightfall and Dab- can answer. the Infocards are all submitted in one file, right?
EDIT: Oh look! Nightfall's on! Hey! Nightfall! Over here!