Question about valves running hours

That makes no sence at sll. I recently bought the Excellent Jolida 
Fusion 3602  integraded amp.with a bunch of of upgraded parts including the Excellent 
Rike Audio paper oil capacitors that take 300 hours to break in.Check out their Amplifiers  $300,000+.
I have used Vacuum tube gear for years as of today I have been running this Integrated amplifier one week straight 24-7 with 
Vintage  output and phase splitter tubes, the second week changed out the EL-34 tubes  input tubes after 175 hours ,and installed KT- 150 Vacuum tubes just flipped a switch on back. Factory stock tubes are guaranteed for a minimum of 1,000 hours of play time.Vintage tubes many times that .
If your amp is built correctly it should have a stand by circuit, as well as a slow start so a surge  of voltage doesn't shock the tubes on start up.
Also manual bias of the larger input tubes is much more accurate 
Way of biasing the individual tubes ,auto biasing has a bunch of resistors to average the circuit which in turn takes away a bit from the accuracy a bit overall.this several engineers Have said as a purist approach. 

To further clarify. Like myself I wanted to completely runin the circuit
And left on for 300 hours non stop. My amplifier sits on top of rack 
And heat is not a issue tubes are made to dissipate heat mainly from the Larger input power tubes with no issues,or danger.any quality 
Amplifier has safety circuitry between the digital circuitry,as well as fuse. Good power tubes you should get at least 3,000 hours . My smaller   preamplifier tubes all are Vintage  1950s
Vintage tubes on average at least 10,000 hours possibly much more.
Onot any amplifier brought into the U.S check for U.L approval  . If not it has not been  verified and Electrically approved.if bought on Ebay 
Verify before buying. In Europe EU  approved.in the U.S you cannot Legally sell  without it ,or face $$ liability if something happened !!