Zoo Meds Original Banquet time release feeding blocks last 3 to 14 days, depending on block size. In addition to weekend and vacation feeding, Original Banquet is a great daily food source for problem feeders such as Plecostomus, Algae Eaters, Redtail Sharks, Gouramis, Saltwater Tangs, Angels and Damsels. Original Banquet blocks are also very useful for small fry which do best when constantly feeding.