How many times can you answer Subway's survey to get a free cookie?

Customers can receive one free cookie per week from the Subway survey promotion, as of 2015. Each survey also requires a different receipt, so a customer cannot use one receipt to get two free cookies, even if they are a week apart.

The survey itself is short, fitting on one page with no questions that require respondents to compose original answers. Subway estimates that the survey should take around one minute to complete. The survey site has a mobile page that works very well on tablets or smartphones, so these devices do not increase the expected time frame. The customer receives the coupon code for a free cookie with a valid purchase via email after completion of the survey.