There are many different variables. The driver is a big one, more slipping of the clutch while driving will decrease life. Obviously lots of hard launches don't help. And a leaking rear main oil seal will seriously screw it up.
if you drive it right it should last a really long time....... my dad had a truck with 120k and the original clutch still in it. A friend of mine races his civic and he puts a new clutch in her like every 6 months.