Final answer:
The number of times you can call the 'all_products' function on a webpage depends on the application's logic and performance considerations. Typically, it could be called multiple times but is often called once for efficiency.
Step-by-step explanation:
The question seems to be related to a function named all_products that you may be calling on a webpage. Without specific context, such as the programming language or framework in use, it's difficult to provide a definitive answer. However, in general web development practices, a function can often be called multiple times depending on the logic of the page. If all_products is a function that retrieves all products for display on a web page, you might call it once to display all products but could theoretically call it multiple times if needed for different purposes on the same page. The limitations would depend on factors like the performance impact of multiple calls and the structure of the web application.