Mine is on full time, but the noctua cooling fan setup on this BitAxe gamma is really well thought out. Rather than dragging the airflow directly through the asic, it draws the air sideways over cooling fins on top of it. The board itself never gets impure air pulled through it to accumulate dust. I’m sitting at 5 months 4 days since my last reboot when I shuffled my computer desk around and had to power down my miner and my start9.