You might want to check with Performance Friction on that, depending on the grade of friction material used. But, I always 'took it easy' on new pads until they went thru several heat cycles (for out gassing of the pucks and adhesives). Also, if you installed new rotors you'll need time for the pucks to bed. I would guess-timate 50 miles of stop-and-go driving should do the trick.
Good Luck, Dave.