It depends, with perfect components maybe as rare as one bitflip a year, or maybe even less. However you can have all the spectrum with slightly defective compo

It depends, with perfect components maybe as rare as one bitflip a year, or maybe even less. However you can have all the spectrum with slightly defective components. There are some rates that are really unfortunate because you don't even detect them with a few hours of memtest, yet when you use your WS for lets say a few weeks every so often you have a random extra non-deterministic fun crash, like an ICE that disappear when you relaunch your build. Unless you have some funny notion of how you want to spend your time, you don't want to risk to fall in that situation...