Pond Fish Feeders
They can hold large amounts of food, often various sizes too, so that a variety of fish can be fed. A timer controls how often the fish are fed, and some advanced designs such as the Cloverleaf Auto Fish Feeder have a computer device that can be set to feed numerous times per day.
A food block is a great idea too, as the fish can nibble away. Try the Swell Vacation Pond Feeding Block which can feed fish for up to 3 weeks. One of the advantages of a feeder or a food block can be that you don't have to rely on a neighbour and risk overfeeding.