I can see that someone who wants to be a professional historian of Scandinavia might want to learn Danish, Norwegian, and Swedish; and a historian of Spain might learn Catalan, Spanish, and Galician at the same time.
At least, those makes a bit more sense to learn together than, say, learning Quechua, Xhosa, and Tamil.
I don't think it will be hard to talk the OP out of this challenging task.
EDIT: I just remembered a friend of mine got a Master's in Classics, which included learning to read (not converse in!) a half-dozen or so languages over a couple of years, including French, German, ancient Greek, Latin, and Sumerian. She spent almost all her time studying, surrounded by dictionaries.
I dont think im disciplined at all, its mostly what im interested in. I know most people spend leetcode 4 hours a day after work and all day on the weekend. I used to do that, but i stopped doing that as that's not for me. Now i have too much time
Is this ridiculously unrealistic or are you actually disciplind enough to pull this off?
Why do you even want to learn 3? There's not that much point learning 3 at once, try learning one.