Do I NEVER shut it off…?

I had the same question for whether to keep my first watt j2 on all the time or no. i posed the same question to Nelson Pass and he said one should keep it off until an hour or so before listening. Keeping it on all the time can reduce its life he said. 

You can leave it on all the time but it is best to shut it off for obvious reasons but for the best sound all the time you need to leave it on.

My Pass Labs XA-25 has not been turned off even once since it was plugged in...except for a couple power outages that lasted a few hours during storms. 

My Pass XP-15 doesn't have a power switch. 

Hello, 
First, I would ask the manufacturer. Something with a fan motor will not last. If you listen every day I would leave it on. If you go on vacation for a week or so turn it off. Somethings do not do well when they are turned on and off all the time. Some manufacturers didn’t even put a power switch on there amps. I have tested this myself. Most things improve drastically. If you can’t hear a difference then go according to the manufactures recommendations. I can’t imagine the caps are fully charged in an hour. I remember the big Electrocompaniet amps sounded best after 2-3 days though they were the size of carry-on suitcases. I do know that some standby power options still leave the amp pretty charged up. I am demoing the Ayre VX-5 amplifier. At first the amp was a little sterile, but the bass was really punchy. Two days later it sounds like heaven. Everything sounds so detailed and very life like. The store I buy gear from in the Chicagoland area is the only Ayre dealer in three states. https://holmaudio.com/
At 175 watts per channel this Ayre VX-5 amp is awesome. Any ways, Call the manufacturer. Ayre said leave it on unless you are not going to use it for a week or so. It sounds better.