The lifespan of brake rotors entirely depends on your driving habits and how you drive the vehicle.
If you ride your brakes a lot and wait to replace your brake pads until they're fully worn down then you might need to replace the brake rotors sooner.
Brake rotors usually last from 30,000 to 70,000 miles but I've had a vehicle where the brake rotors never needed to be replaced until the vehicle had 120,000 miles on it.
That's because the brake pads were always replaced when needed and the brakes were used properly.
So some brake rotors on vehicles can last longer than some others it just depends.
But do have the brake rotors and brakes checked at 30,000 and 70,000 miles just to be sure.