Leave solid state amps on? Or turn off everytime?

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."

How many operating thermal cycles could be regarded as "normal" within let's say a year? --> 300 times? 600 times? --> 3000 or 6000 times/10 years. Btw, does the "on" cycle have the same effect as the "off" cycle?

Chris

Chris - I don't know about cycles but heat cuts down life of caps by two every 10 degree Celsius (18 deg F). It might be irrelevant for many people if amplifier lasts 20 or 40 years.