At the moment, yield is 24.5 ツ / mini / day.
I have 3x mini offline thanks to ded power supplies (the fanless brick kind). Can’t make a trip to that location until next weekend to replace. And 3x mini in transit that I recently purchased. In the market for another 2 if anyone is selling.
I’d say failure rate for fanless brick PSU = 100%, given enough time (days to years), which is why I’m converting over to industrial PSU w/ fan for longevity (closer to immortal, but you can inadvertently kill by not being mindful of the voltage switch). For 4x internal fans of the mini, they too will all fail given enough time, user replaceable. Control board, rare, but those fail and are DYI repairable through replacement too, I keep a few on hand just in case. Board with mining chip never seems to fail yet (only one DoA from my XP that smoked at initial launch deployment, was replaced under RMA through iPollo (purchased by ツ payment to iPollo), and that could have just been the control board that fried).