Garm Bel Iblis
Commodore
It's not a word, but more a general idea: the Captain/someone else/ the entire ship is diseased/in an area with lots of radiation, and the doctor warns that they've got 17 hours, 47 minutes left. After 17 hours, 46 minutes, nothing is the matter, and there will be no long-term damage, if there is even any damage at all, but after 17 hours, 47 minutes, they will just drop dead.
or hwo about on Enterprise when Trip and Reed are on the Romulan ship and Trip's being irradiated and dying, then they "turn it off" and he's fine