My first HT trail bike lasted 8 years with me before I sold it to a friend. He's still using it, the bike's on it's 14yrs now. While with me, I never replaced the Alivio drive train at all. I only do a regular chain replacement... every 2,500km. As previously mentioned, a regular chain replacement helps in lowering the rate of wear and tear for your chain rings and sprocket. I did the same with my current bike's 9speed Deore (6yrs), only changed them this year and it's because I wanted to try the 1x10 setup.