Yes, you can use the feeder for more than one week. The duration of use will depend on the feeding settings you choose.  Typically, when filled to the top with 3 feedings per day at level 5, it can last for a little over a week.  However, it's important to note that the actual duration may vary depending on factors such as the portion size and your cat's specific feeding needs.  It's always recommended to monitor the food levels and ensure an adequate supply is available for your cat.