It typically takes at least a few weeks of supervised introductions for cats to start getting along, but it can sometimes take several months or even longer for them to become relaxed and peaceful with each other. Some cats may never fully get used to each other, so patience and careful management are key during the process

. Key points about how long it takes for cats to get along:

• Initial supervised introductions usually last a few weeks, involving controlled interactions and gradual exposure

• It may take months before cats are fully comfortable and relaxed around each other

• The time varies widely depending on individual cat personalities, ages, and prior socialization experiences

• Male cats, especially if unneutered, tend to be slower to accept new cats and may engage in more physical altercations; female cats may challenge each other but often fight less intensely

• Positive interactions, such as feeding together and playing, help build tolerance and friendship over time

• Some cats never become best friends but can learn to coexist peacefully without aggression

For kittens, socialization to humans and other animals is most effective during a critical window between about 2 and 7-9 weeks of age. Kittens socialized during this period tend to adapt more easily to new companions

. For adult cats, especially feral or unsocialized ones, socialization and acceptance of new cats can be much more difficult and time-consuming, sometimes not successful at all

. In summary, expect a gradual process that can take weeks to many months, with no guaranteed outcome, but consistent positive interactions and patience improve the chances of cats getting along well.