I removed the tag from questions that didn't really need it, and only two remained that kind of need it -- when the concept of time keeping itself is discussed, not e.g. "how much time to spend in Zanzibar". I think that should be the intended tag use, if we decide to keep it at all. Suggestions for tag synonyms welcome.
Update: As @Flimsy points out, only one question remained with the tag, and it didn't really help in explaining the question, so I removed it as well. Thus, the tag has no current questions associated to it currently, though if questions on time-keeping do arise in the future, it would be the appropriate tag to add. Meanwhile, it will be removed automatically at some point in the future if no questions use it.
We could possibly ban it, but I don't see a strong case for this as it stands.