username - I have done exactly what you are proposing and have not once been denied points or stay credits. Sometimes it has been on purpose, others it has been due to change of plans or cancelled flight. I check out in the morning, check back in that evening and get credit for 2 individual stays.On the 25K promo, it was # of stays, not # of nights so checking in and out was clearly an advantage to staying 3 consecutive nights. This is against the rules, however.