Many questions in the close vote queue have comments asking for clarification, as well as close votes because they're "unclear" or "too broad" or "off-topic/questions seeking debugging help ...". The question may only be a few hours old.
How long is it appropriate to wait for clarification? Should close-voters vote differently, or hold off for longer, on questions with such comments? Is the software wired to take any of this into account?
The only prior art I found was this
which was written for a smaller and slower-moving community.
Personally I'd give it a day if I were interested in the question (which others should recognize because I took the time to comment). I've seen comments elsewhere on MSO which suggest that some expect clarification within hours. Seems like we should all get on the same page.