If a player gets the condition from a Chilling Touch:
Target must make a successful DC 13 CON saving throw or be unable to regain HP. The effect can also be ended with a Greater Restoration spell or comparable magic. Repeat saving throw at end of each turn, ending the effect on itself with a successful save.
and combat ends without a successful save, what happens? Does the effect just go away immediately? Do they stay in combat time making saves until they succeed? Do they stop making saves and require a Greater Restoration spell? Can they "take 10" or "take 20" to end the effect? Seems like a fairly serious condition requiring Greater Restoration to end it if it just goes away after combat ends. I cannot find any RAW on this and Internet searches only talk about Death Saves which I understand stay in combat time until made, character dies, or someone heals or stabilizes them.