A Walmart receipt is typically valid for the customer satisfaction survey for up to 7 days from the date of purchase. To participate, you must visit survey.walmart.com with receipt details and enter the required information printed on your receipt. If you wait too long, the survey code may expire, preventing you from completing the survey and becoming eligible for any available rewards or sweepstakes entries. Always check your receipt for specific survey instructions and expiration details, as they can vary by location and promotion. Completing the survey promptly ensures your feedback is recorded and your receipt remains valid.