How long do buffing wheels last?

[L98-Z]

Just as the topic states, when do you change out the buffing wheels. How many rakes until no longer?

[marsfrogie]

Just use it until you either grind it to a nub, or can't keep the sfpm up in the ideal range. All depends on how aggresively you rake it.

[CamaroMike]

I always try to get the most out of each wheel I use.