The McDVoice.com survey is typically valid for a limited period after your purchase at McDonald's. Customers are usually required to complete the survey within 7 days of their purchase date, as indicated on the receipt. To participate, visit mcdvoice.com survey, enter the required details from your receipt, and provide honest feedback about your experience. Completing the survey within the validity period ensures you can claim the reward, such as discounts or free menu items, as specified on your receipt. Always check your receipt for exact details, as validity periods and survey rewards may vary depending on location and promotion.