PS- modern serpentine belts and hoses can literally last the life of the car assuming they aren't contaminated with oils-

GM considers belts and hoses as "lifetime" and to be only replaced as needed on inspection.

With that said, one radiator hose on my car is just now starting to burn through at 170K miles- found a soft spot on it. Others are fine.

__________________
03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)