Ok, this might not be as on point as I'd first thought, but what would be the record for shortest 10@10? Longest? Has it ever gone past 11?
Shortest: Can't name any specific sets, but we've had a number of mid-60s sets (65, 66, 67) that were pretty short--barely cracking 30 minutes, iirc.
Longest: Dave's annual Foghead Christmas Card sets usually went pretty long, around 50 minutes or so.
More than 11: This one I can cite specifically. On March 6, 2002, Dave ended a 1974 set with Genesis' Back in NYC>Hairless Heart>Counting Out Time from The Lamb as Tune No. 10, but technically stretching to 12 songs " 'cause you really can't break those up."
We've also had a couple of 9-song sets in which Dave got distracted and played one too few songs.