8GB would be about 13 hrs of 16/44. I heard that a card will freeze if it runs continuously for 2GB or longer and I think that happened to me one time back in Feb but I was too drunk to be for sure.
ScanDisc 2 and 4GBs here.
edit to add> There is a thread(s) somewhere that covers everything you'd ever want to know about a 660 and then some...