I use Edge 8" pads via rotary only. They seem to last quite a while, my current green polishing pad has at least 10 full details per side, it will be replaced after a few more details. My yellow cutting pad has about 5 full details on each side and shows just as much wear but I beat the hell out of that thing on a couple neglected finishes. My blue pads seem to last the longest, I just replaced my old one that was at least 5 months old, can't say how many details I did with it.
Aaron from Edge said that they expect around 15 details per side of the pad, that's about what I'm getting
Dolan