GXCS4 longevity??

Posing this to owners that have had theirs for awhile. Looking at one and thinking I would need 40 top offs of my 60 min tanks to break even money wise on that compressor. Looking at a good 40 hrs of run time assuming 3k to 4300 top off is about an hour ?? Just curious how many have a good 50 hrs + on theirs ?? Also has anyone rebuilt one ? Was it straightforward and were you able to get parts from target forge ? Thanks guys.
 
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I don't have that many hours on mine and just use it to fill guns and a 90ci tank. But, this guy works for GX Pumps and his YT Channel has a lot of good info on rebuilding and repairs.

 
Even though it won't answer the OP question I received mine a few weeks back, I only fill a 500 cc bottle and a 300 cc bottle that are on my two rifles, both usually from about 125 bar up to 290 bar. It takes minutes. It takes a few minutes each. At this rate it will take a longggg time to even get to the six hour turn the grease pot mark. LOL
 
This thread is timely for me as I am looking for a compressor to simply fill my guns…💪💪💪
I highly recommend the GX CS4 or CS4-I if you need portable and/or less expensive (though they are not cheap, by any means). If money isn't an issue, and you won't be lugging it around in the field (It weighs 106 lbs), get the GX E-5K2.