The amount of fruit needed for 30 guests will depend on several factors, including the type of fruits, portion sizes, and whether the fruit is the main focus or one of many food options. As a general guideline, plan for approximately 1-2 cups of mixed fruit per person, which would amount to around 30-60 cups of fruit for 30 guests. Consider the variety of fruits, their availability, and adjust the quantities based on your guests' preferences and the overall menu.