If it is user oriented, I would release the project and make sure you have a feedback loop to see how the project is being used by the end users. You are finish

If it is user oriented, I would release the project and make sure you have a feedback loop to see how the project is being used by the end users. You are finished when they are happily using your project, you usually don't get to decide for them. If the project is presentation oriented, or if you only think you get one shot, then I usually step away, come back, make a punch list, and complete the project by completing the punch list.