It has a 45 second duration. If EOS can keep the tank above 50% HP without any additional healing outside of free regens like embrace, it was probably a really easy fight that required no healing and you would have oGld heals to spare even with the waste.

I think the more common cause is other healers continuing to actively heal, even though thry don’t need to. I guess it might matter if you cast it during dungeon downtime. Then it might go off 10 seconds into battle and be wasted.