There was a game shown by Daniel Rensch on the video lessons where the whole game went with no captures, it was a member analysis 
longest time before the first capture
i remember seeing a master game that was like 25 moves or something i think? it was in the ruy lopez
93 moves without a capture: http://timkr.home.xs4all.nl/records/records.htm
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What is the longest a game has gone before a piece or pawn was captured?