Say I have a mid-range Yamaha audio integrated amplifier, which uses decent (Panasonic FC) but not top-end (Panasonic FM) electrolytic caps. I use the Yamaha for a 1 year, typical non-abused use, about 2hrs/day (so, ~720 hrs total use). The amp is powered up for use and powered down after use (note: on/off may be more stress than always-on). Then I get a new amp and put the old Yamaha in storage.
Assume room temp use/storage cond. always.
W/o ESR-meter (or other) testing, how long will the old Yamaha's electro caps last in storage? E.g., not leak or "vent out"? Or should I be worried about other components in the device "rotting out" before caps?
P.S. Another way to think about it is when pertaining to new old-stock components or gear. E.g., say I buy sealed (in-box) 20-year-old PC PSU or motherboard on eBay.