With blessings of Life, to Preserve your body, that you shall not perish.
The spell stops the target’s count from Bleeding, Critical, or Lethal status towards dead for the duration of the spell. If the target is not brought back from that health status during the duration of the Preserve Body spell they once again start their count at wherever they had stopped it.
Thus, if a target had but 30 seconds left until dead and was preserved by this spell, yet not brought back from Lethaly Wounded status in 10 minutes, they would again start their count at 30 seconds remaining once the spell ended.
This spell may instead negate a reduced count or forced dissipation effect such as Decay, but does not also stop the target’s count.