How long will a crown last?
The material itself (whether ceramic, metal or ceramic/metal hybrid) will last an eternity. It’s the other variables that come into play when the crown is placed in the mouth.
Potential failures come from fractures of the crown (porcelain chipping or breaking) or fractures of the tooth.
Also, the tooth to which the crown is attached to can still get decay which will result in the need to replace it. And once a crown is placed on a tooth, it is not immune from having periodontal issues.
With appropriate case selection, material choices and maintaining regular hygiene visits, the general rule of thumb is a minimum of 7-10 years.