Couple weeks, or until another new one shows up. This is what I usually experienced.
But then there are those hens that never give up. So it is also an individual thing. If it gets bad you can take one of the old hens and one of the new hens, put them in a dog carrier together with food and water. See that the new hen isn't injured, but maybe they will make friends if they can get along.
Leave them be for a couple days, then put them all back together. Might work. Just don't let anyone get hurt-you'll have to watch them closely for an hour or so when you put them together in close quarters. Even then it's risky- she might get pecked or bloodied if they are vicious.
Some are easygoing and will not draw blood, others not so much, so I wanted to warn you.
But then there are those hens that never give up. So it is also an individual thing. If it gets bad you can take one of the old hens and one of the new hens, put them in a dog carrier together with food and water. See that the new hen isn't injured, but maybe they will make friends if they can get along.
Leave them be for a couple days, then put them all back together. Might work. Just don't let anyone get hurt-you'll have to watch them closely for an hour or so when you put them together in close quarters. Even then it's risky- she might get pecked or bloodied if they are vicious.
Some are easygoing and will not draw blood, others not so much, so I wanted to warn you.