Then you have no idea how many didn't make it into finished product.
According to Fable II designer Peter Molyneux, there were 67,000 bugs in Fable II that the development team needed to squash. That's... a lot.
"At one point we had 67,000 bugs," he said, "and when the Xbox test team tested the game they rated us super-black. That never had happened to a game before, Microsoft had in the past rated some games as 'Red', but never 'Black'."
According to Molyneux, "It was thought that coming back from black was impossible." But Fable II did just that.
Molyneux is currently working on the third iteration in the series.