Integrating 4 new Hens---How long before you think they'll be accepted

[mamahen09]

We had a hard time getting the 4 new hens introduced to an established flock of 13 hens & 1 Roo, so we have them separated in their coop by a fence. How long does it take for the other hens to accept them into their flock? And in regards to the established flock.... is it normal to have one hen in particular that is a little you know what....very hateful...even to the hens that are around her....(constant pecking & feather pulling.)
Is this one going to cause a problem when the time comes to take the fence down?

 

[chookchick]

I have kept my "newbies" separated by wire, but visible for 3 weeks before trying to integrate them. They have to start thinking of the birds as "part of the flock", versus "strangers". Then I integrate them, but keep an eye out at first to make sure no blood is drawn. I think most people have a hen that is the B**** of the flock, mine used to be the lowest in the pecking order! She'll be a pest, but she'll get over it eventually. Make sure you have enough room and extra feeders and waterers for everyone, so they are feeling threatened.