Every two years when I trade in the car.
Clutches are like brake shoes/linings. They will wear out eventually.
It all depends on how you use them and the kind of traffic you drive in. Long haul steady laying the rubber down and they last longer.
In town start, stop, speed up, slow down, repeatedly will bring on an early demise of brakes usually first and clutch second.
Carpooled with a lady one time who either had her foot on the gas or on the break. Wasn’t too long finding another car pool. Replaced brakes and clustch about 15 K. mi.