I don't see any problem with this phrasing.
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dave_anonIf there was a robbery at the shop at 12:55 then "at about" is not sufficient. It makes a big difference whether you saw him go in at 12:54 or at 1:05I don't think this is related to the validity of the combination "at about" per se, which I think Anon is primarily asking about. People often don't know the exact time that they saw something. I