So I'm getting hundreds of hits (per month) across multiple separate domains, all originating from one city with 100% bounce rate and 0:00 time spent on the site. I know hundreds of clicks per month isn't that much; is it just some web crawler that Google Analytics isn't identifying?
I tend to side with the previous respondents, but bounce rate and time-on-site do factor into organic listings so, depending on your hosting you may be able to block by IP if you are especially concerned about it.
That said, a bit of time and wisdom (as in less than 2 years...don't judge), has helped me realize that short-term fluctuations--be it crawl/users/competitors (trying to game the system) etc.--are, in most cases, insignificant in the big picture. I nearly refuse to look at reports like "the last 7 days" anymore due to their capacity to induce stress and be misleading.