We have a 7yo male cat and have just gotten a kitten (yesterday). Kitten is currently living in spare room, we've been doing flannel scent swaps. Cat hasn't reacted at all to the flannels. The kitten has been meowing since yesterday (not continuously or anything) and I'm certain older cat was able to hear but no reaction. Then he seemed to suddenly understand that there was another cat in the room, I think that he caught sight of paws or movement under the door. He hissed a few times and growled once then wandered off downstairs. From what I've read this is to be expected but just wondering how other peoples introductions went and roughly how long they tool until the cats reached a tolerance?