While the T&Cs state you should only get credit for one room/night within the world Marriott family of hotels, many of us have gotten credit for two hotel stays for both the situation you describe, a long stay at one hotel with a night elsewhere during that period, and where you check out of Hotel A so late that you wind up paying for the full night while checking into Hotel Bl very late at night in another city. Where people report having issues is where a second party checks into the second hotel (like the member staying in Detroit while the spouse tries to check in using the member's MR# in Dallas using the "meeting me later" trick) or simultaneous multiple stays within the same city. Other chains have allowed the latter in the past, but not Marriott.