Wither removes YEARS from a character, not HOURS.

Because of this, short-lived races (Think orcs, humans, felar, arial)
feel the pain far more than the longer-lived races such as giants and
elves who generally live centuries.

In particular, felar and orcs tend to have lower wisdom, which compounds
the problem, and furthermore orcs also tend to really double down on
damage vs. saves, leaving them often vulnerable to wither. It's
definitely something worth keeping in mind as a low-wis, short-lived
race.

(Yes, I've played an orc that got brutalized by this)