When is it actually a plateau?

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I am just curious about this. So many people post that they are in a plateau and it seems like it is just normal and not actually a plateau. I never thought that not losing one week or even two is necessarily a plateau. I've always thought maybe 3 weeks, but usually more of not losing weight and doing what should be right would be a plateau.

So, does anybody know how long of not losing/seeing results until it is really considered a plateau?

ETA: NVM! I just found a post. For some reason the first time I searched it didn't come up. Sorry!