I typically run tyres to the ground, and Sorex's have always been more durable than others. Ran 40R on asphalt with 17.5 boosted and they take forever to wear to the belt. An estimation would be about 30 packs?
Looking to try the Sweep R series, the one with the high sidewalls. from a translated sweep website, it supposedly lasts 50 packs in modified.
Link