Can the question How long could a Oxygen/Nitrogen atmosphere last on the Moon? be asked if it has already an answer to this similar question ?
With just the key words "atmosphere" and "moon" the asker would have come easily upon this answer.
I think I agree with uhoh that while that other question may technically have a simple answer to this new question, the answer to this new question includes details more specific to the question of "how long" that are understandably glossed over in the higher level question.
I do think there's still room here for an even more thorough answer as well. That being the case, I believe this question should remain open.