Is it worth buying a second hand xbox used for 2500 hours?

First question you need to ask is, does the series X have a reputation for hw failures after a certain number of hours? Not a console guy but I remember the early 360s did do that, with the whole red ring of death issue. If they're using a bargain bin mosfet or cap somewhere, that should be causing problems for many people. Seems unlikely, but it happens.

If not, then 3000 hrs / 480 days is only about ~ 6.25 hours of usage per day for less than 2 years. Most consumer electronics has components that are rated for far longer lifespans than that, assuming that the temps are kept reasonably under control. Odds are they'll outlast the mechanical components like the fans.

So if the console is in great condition otherwise, I would go for it. Maybe repaste and clean it once you get it.

That is a bit of risky purchase.
Now if it has been used and kept nicely. It might still have quite some life left.
However, It is something you will be taking a chance in my opinion.

I am unsure if you should go for it or not. Maybe if he allows you atleast 3-4 days of usage to you to test out to your satisfaction and if you find no issue go for it. If not , I will advice avoid.
rest Your call ofcourse.

i think 2500 hrs is not much hrs you will be fine but I would suggest you to check the controller mainly for stick drift and condition

2500 hours may sound like a lot, but it's just 6 hours a day over its present lifespan. No different from a PC. The Series X has no history of HW failures, IIRC. If it's maintained properly, it's a great deal.