Hi there All, I've been in my apartment for awhile with my 3 cats. Now, my friend is moving in and bringing 3 more cats with her. While hers were still in their carriers, there was a lot of hissing and shackles raised. Friend's cats will be upstairs for awhile. We would like to know the time for keeping them apart before trying to get them acquainted with each other. Any help will be appreciated.:eek: