How many hrs?

The “real” answer.. depends on how its wired, plumbed, configured, And managed.
"Beef" is built-in to the components.
Reliability is about the builder,

.. and driver
.. and PitCrew. Eh?

Your question is a "culture" question, more than hardware..
but I'm curious f "How" people answer e question.

Got details ?? give YOUR report..
 
My first Hotsy lasted 7 years and then needed packing done, then it was every year for a couple more years and then the case cracked and timd for another pump.
 
I have put 200 hours on my new setup the last 2.5 months, and that's using all three trucks for different jobs.

Newest setup 200 hours
Diesel isuzu 27 hp, 9.5 legacy pump

Second
3200 hours
35 hp briggs, just oil changes, filters, plugs
One 5.6 general, done all the seals once, one legacy 10.6 gpm pump for about 1000 hours on the other side of the engine, nothing broke.

Third
Engine 21 hp briggs, 450 hours, plugs, oil, filters.
Pump Cat 5cp3120, I have beat the crap out of this pump, had it since I started and it has outlasted a couple engines and only had the oil changed once. Did a valve a couple years ago because some debris had it stuck open, but it is easily in the 8-9k hour range. This setup see's the least amount of work now, but it has paid for it's self many times over.

As Jerry mentioned, everything comes down to how well the system is made and how well you keep up with maintenance. Every system I have had is custom made, I make them a lot different now then I did at first. In 7 years I have only left a site once when the engine dropped a valve, I was back in 75 mins with the same truck and a new engine. I don't make money or happy customers with broken equipment, so I do my best to make sure that doesn't happen.
 
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