Join Date: Aug 2002
Location: WAS/TYO
Programs: UA 1K, AA EXP (3MM), DL PM, BONVOY TITANIUM, HYATT GLOBALIST, HILTON DIAMOND, IHG DIAMOND AMB, et al
Posts: 6,257
While I lack firsthand experience, I would fully expect the benefits of whatever status level you held on the day you checked-in will carry over through the duration of your stay.
-FlyerBeek