What is my little brother doing there (Fortnite)?

His Ps4 is now running 20h a day and he doesn't even do what he is crouching next to on his cell phone and is in the lobby. No waiting for live event, no Ts, what is he doing?

When I ask him what he's doing, he screams hysterically… That's why it's suspicious

I used to do that too, it's just boring. Maybe he had a good time with his friends and has no one to play with, ka. Maybe he farms game hours. Can have many reasons