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I would say about 4 months. However, we also observed that they are also depending on the voice that they hear. When my family call out their names and they are used to our voices already, they would easily respond. However, when we have guests over, even when they call out their names so many times, they still would rather ignore them. I think aside from the name, they also base their familiarity on the voice.
Cats are usually like kids as well who get a bit scared when there are strangers. They are very territorial and so they tend to just stay at the corner of their comfort zone each time they would see anyone or something unusual.
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