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You can use an automatic fish feeder to make sure your fish get enough food while you're away. You can also ask someone to come check on them regularly and give them small amounts of food.
The amount of time you can leave your fish on an automatic feeder depends on the type of feeder you are using. Generally, you should plan to have someone check on your fish every week or so. It's a good idea to research the specific type of feeder you're using to determine the recommended length of time you can leave it on.
It depends on many factors, including the type of fish and its age. Generally, adult fish can go up to a week without food, while juveniles or younger fish may only be able to go three to five days before they need to eat.