Yes a strange question... How long do you think a v-belt will last on a serpentine pulley, actually the ac compressor? I don't expect to last long maybe 3-5k. On my aspire the older engine I put in it wouldn't except the newer serpentine pulleys. The main crank, and tensior are v-belt. In the future I was going to try to put one of the older pulley/clutch assemblies on the compressor but I haven't found out for sure if it will work. The ac was working good a year ago thats the only reason I don't change out compressors.