You will not lose them as soon as you check out, but they will be active only until midnight after you have checked out of the first resort. Also note that you cannot combine credits across reservations (if you have one credit remaining on your first reservation and you want to go to a 2 credit restaurant, you will not be able to combine that one credit with a credit from your second reservation to pay for a 2 credit meal. You can, however, pay for one person's meal out of the first account and another person's out of the second account, as long as the accounts have sufficient credits to purchase the meal.