how many moves into a game have you gone without losing a piece?

I do remember a game that I played, we were 10-20 moves in and the centre of the board was an interlocking wall of pawns, the only way through the wall was with a knight...so I did it...

Well, assuming you're not counting pawns, I have gone entire games without losing a piece. I'm sure there are many like me -- not too big of an accomplishment.