Depends on how fast after launch you are, how big the flood is, and what CPU(s) you have... Aka too many variables to be precise, but assuming you're fast you should be able to get a bunch. Setting up farms will take a while, but the fun might be over in about an hour, like with karmacoin yesterday. (diff then rocketed from 2 to 9, eliminating all solo-mining except for those with a huge farm)
Oh didn't know about Karmacoin. Played with Redd day before.