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I work for a University with 10,000+ students and alumni that could submit reviews. But how many reviews should I be collecting at one time? I don't want to overload the reviews and put up a red flag in Google...any insight on how much is too much?

Should I delete them? Simply give them a different address like "City, State, Zip"? I see the benefit of having key buildings on campus in Google Maps, but I don't want those to affect my accuracy score and, thus, my local rankings for SEO.