Wirelessly posted (Mozilla/5.0 (Linux; U; Android 4.4.2; en-us; LGL31L/V100 Build/KOT49I.L31L10d) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.1599.103 Mobile Safari/537.36)
I think there is a lot that can done. First you signed up at check in which is technically before your stay began. When IHG talks about during your stay they are referring to in the middle of your stay or at check out.