Ideally your chickens should always be checked twice a day to ensure they have feed and water and are healthy and not injured. If you are going away overnight and have a fox-proof run they should be alright if left with a couple of feeders and drinkers.
If it will be longer than this, then you will have to arrange for someone to come in and check them daily. Whilst it is better to keep your hens in their own home, it is not always feasible and we offer a hen ‘boarding’ service. You can bring your hens to us and we will look after them whilst you are away.