From experience we can say that, as a rule, adaptation takes from 1 to 3 days and depends on many factors. Cats, like people, are different in character, some are more courageous and inquisitive, others are cowards and cautious, others are super phlegmatic and the main thing for them is food and more. The age of the animal is also important, young cats, like children, instantly get used to it on the same day, they are interested in everything and it causes a lot of impressions. Pensioners are more conservative, although not always.
We, in turn, try to shorten the adaptation period as much as possible so that the cat feels at home and not just sits somewhere without parents, but also gets a new interesting experience. He met other cats and realized that in addition to the walls of his apartment, there is a lot of unexplored and interesting in the world.