Your lifespan of your stickers depend on the conditions you put it through. How many times you cube, how accurate did you apply it to the face, air bubbles, temperature, etc.
Mines last roughly 2 months, usually restickering them after I lubricant it. I tend to be very conservative, and my stickers look terrible right before I resticker them. I do 100+ solves on school weeks (Weeks with school days), and 300+ when I have no school.