Let's assume you're a regular member of the band.
What kind of gig is it? Would that number be higher or lower for a different kind of gig?
A related question . . . . How many of your regular songs did you play in your last gig that you didn't play the gig before?
I'm trying to get at the issue of learning and retention. I realize that some songs are a lot more familiar and/or easier to learn that others. The instrument you play and its' function in the band could also be a factor. So is your role as a vocalist. So is the number of gigs your band plays per month.
Maybe we're too diverse a group, but I'll try anyway.