How much time does it take for two adult cats to live together?

To make it simple. I already have an adult cat and i've had for 3 years now. This year, my dad bought me another one, but slightly younger. How much time does it take for these adult cats to live together PEACEFULLY, because everytime they meet, they always get into a fight.How much time does it take for two adult cats to live together?
It depends as first poster has said.if its 2 not neutered males, it may take a while and/or may have to get them neutered.

If one is not neutered,yet the other is, it may be the same as if 2 males cats are not neutered, the not neutered one may take a while to calm down... Though we were fine with ours, we took in a male not neutered cat and we already had a neutered one but they worked out fine with each(both young adults)..

If they both are neutered or not even male, female, then it wont take too long for them to adjust.How much time does it take for two adult cats to live together?
If they are 2 males and neither one of them is neutered they may fight all the time. If they are neutered it is just a matter of time.How much time does it take for two adult cats to live together?
Keep the new cat in one room with the door shut for a few days (Obviously check on her daily). The two cats will sniff each other under the door, get to know each other and understand that they're not fighting for territory and all that jazz.



In a week or two, if they don't get along, try to find a better home for the new one?



Hope that helps.
From my experience I adopted a female cat when it was a kitten.A few months later I got a female cat from my dad. It took them about a week to get along. When my girls were 6 years old I got a male and took about a week also. It is normal for them to hiss and fight some. There trying to be in charge. The good news is they get tired of hissing and fighting and they get along! My 2 girl cats are 10years old now and my male is 6 years old now and they get along great!



PS give them time and show all of them you love them and you don't favor one and in time they will get along!