At Twister, you can probably get away with one set all night, as long as its only two classes for predator. Wear is not going to be too much of an issue, but wiping too much can make them too saturated for the last feature. Wiping more at home early in the week and less at the track is going to be important. Ideally you would want two sets for two classes. Not one set for each class, but one set for heats and one set for features.