Not a very helpful answer i suppose but i guess how long it lasts will depend on how much you make it slip. My ally standard clutch is still going stong after 13,000 miles i think it is. Makes a few noises when pulling away but its not slipping yet. Done four trackdays on it a well. I would guess than unless your a very hard road rider then a slipper would last as long as any other on the road. On the track then i dont know!