Oops. Yes, an average of 3 cycles per day, not per year!
I have the spin down timeout set to 20 minutes. But this is a desktop PC with intermittent usage (and different usage patterns over the years). They used to be in a RAID1+0 but now they're JBOD and I use them as scratch drives for random stuff.
What is your spin-down time? I use the following on my server's fstab: