Barking for a while: How long you have to put up with your neighbor's dog constantly barking - and possible solutions. It is completely normal for dogs to bark and is part of communication.
But it should be kept within limits. There is no specific time period for how long a dog is allowed to bark, as this depends on local regulations and agreements. Many municipalities have noise ordinances that limit barking to certain times of day or for a set duration. A dog should not bark for more than 30 minutes total per day and no more than ten minutes at a time.