>Is it proper to re-post a question that went unanswered? If yes, what would be the waiting (and hoping) period?

I only saw 1 unanswered question for you this month. More than enough time has passed as far as reposting is concerned. I would re-post an unanswered Q the next day if not answered within 1 day. The exception may be if you posted on a Saturday or Sunday, I might wait until Tuesday to re-post. There really is not guidline. Just use your good and reasonable judgement.