I should have 1 from each day - Friday, Saturday & Sunday. This is what I received:

#1429243 Credit: Daily Survey - 10/18/2008 0.80 Credits 10/20/2008 Paid
#1429242 Credit: Daily Survey - 10/18/2008 0.80 Credits 10/20/2008 Paid
#1429253 Credit: Daily Survey - 10/18/2008 0.80 Credits 10/20/2008 Paid

Not sure it matters much, I received what I was expecting, just all on one day rather than spread out across the 3.