Leave solid state amps on? Or turn off everytime?

Pass Labs even states in their manuals that the more often an amplifier heats up and cools down, the lower the life span of the amp. Capacitors also have a longer life if they stay charged.

Someone asked which Pass manual refers to longevity based on power cycles. This quote is from the X25.5 manual:

"So how long will this hardware last? It is our experience that, barring abuse or the odd failure of a component, the first things to go will be the power supply capacitors, and from experience, they will last 15 to 20 years before needing replacement. Fortunately these components die gracefully; typically with years of warning and are easily replaced. After that, the longevity will depend on the number of operating thermal cycles, but we can attest to having had amplifiers operating in the field in excess of 20 years with no particular mortality except capacitors."