If there's a nectar flow don't need to feed. If you over feed they'll swarm on you. All the years I've kept bees I have only seen them what appears to have stopped. They will only do that momentarily. People think you feed until they stop but that's not so. Quite often some wonder why their bees swarmed quit often over feeding is the cause. If you feel you must feed only feed until they have a frame or two of syrup stored then quit.