Namely...(drumroll)...About what's the demographic breakdown for roughly how many moves a chess game tends to last, preferably with pieces captured on the same chart (IE: Two folks sit down to play a game. About how many moves in will the first capture be, on average? About how many moves will the first check be, on average? About how many moves will the game last, on average?) Yes, I know it can vary greatly, but still...it's simple data that one can easily collect over a broad range of chess skill and clearly chart, so I'm presuming someone somewhere must have done it at some point.
If folks have been charting out Knight's Tours for the last couple centuries for no good reason, I'm sure someone must have done the leg-work for this.
For those wondering, yes, I just asked Carl Eaton about it.