Like the PP said, they credit are available upon check in, and will be available until you use them - or midnight on the day you check out. You can use them however you want. Some days we have used 2 TS credits and 0 CS credits, and other days 1 TS and 1 CS. It just depends on how we schedule our days/TS meals. I think the time of day that you arrive & leave the resort also come into play. Some people arrive early and/or leave early on their check in/check out days. This may play into how you plan to use your dining credits.