I used my trainer for the first time tonight. I do have premium tires on that bike and I really don't want to put trainer tires on them just yet as it isn't late enough yet to come inside for the winter. 30 minutes on my Kurt Kinetic, however, really did "shine" my rear tire and I picked up a lot of black when I touched the tire.

Is there a rule of thumb about how long it is safe to use a regular tire on my trainer? Is there one?