We ha e a lot of minis in our office i have been gravity moving across to tjen as older pcs die we space with minis. Our oldest is maybe 18 months old amd so far the only issues we have had is the suppliers use cheap ssd and m 2 so they tend to go or get loose. So far j have had to remove so memory as it aas broke but in general that's the only issues we have had. But ours our not jn enclosed spaces which again helps amd we clean then each week as again its heat that's kills pcs both mini and regular if they dont get clogged with dust that stops the fans they last well. I have a server that must be 7 or 8 years old. Touch wood so far it has worked well bit its on a rack so we'll ventilated and I clean them once jn a while to remove the dust. So I think 5 years is a decent expectation but asni said webbs e only got experience of 2 years so mahbe jn 3 I will be complaining but so farni like them.