I have received stay credit for stays that over lap. I usually stay at the Irvine Hyatt for extended periods. Sometimes I want to run down to San Diego for the weekend so I'll grab a Hyatt for a night or two down there without packing up and checking out. You can get credit for both. However, you will have to call customer service because the first stay to post "blocks" the other from posting. A quick call to customer service gets it posted though.