Yes, you can take the TellHappyStar survey multiple times, but you must have a unique receipt for each entry. Every time you dine at Hardee's or Carl's Jr., you can participate in the survey by using the survey code printed on your receipt. However, keep in mind that you can only submit your feedback once per receipt. Sharing or transferring prizes to another person is prohibited, and participants must be at least 18 years old and US citizens.