root@kamidake:~# for i in /dev/sd? ; do echo $i; smartctl -a $i |grep Hours| awk ' { print $10/8760}’; done

/dev/sda

15.6055

/dev/sdb

15.6979

/dev/sdc

6.04909

/dev/sdd

7.35708

/dev/sde

10.618

/dev/sdf

7.28071

/dev/sdg

10.5689

/dev/sdh

10.6264

/dev/sdi

2.28311

/dev/sdj

10.7498

/dev/sdk

10.5832

/dev/sdl

7.35502

/dev/sdm

10.643

/dev/sdn

10.8016

/dev/sdo

10.7558

/dev/sdp

9.11416

root@kamidake:~#

These are running ZFS and I have 2 other boxes with similar, most in the 10-12 year range. Spinning drives.

Good stuff.