How long do 10 inch bass subwoofers usually last before they start to distort with typical use?

Is this for Home or Auto? I can only speak to Home units. I service units in retail stores. These subs are used everyday for 12 hours. The units are all good makes (avg $600 ea). On average they begin to fail in about two years. So about 700 days @ 12 hours a day.

***now if you are talkin about auto, i can answer that. 10s in a car can vary in their lifetime. Typical use also varies. You may play your music loud or low during a typical day. Everything adds up. Usually they blow or tear the voicecoil, but at an average lifetime, i would have to say, probably 1-2 years, depending on how loud you like your music.