I somehow don't understand. With triple A titles with open world you are faster than just the Fortnite main menu. What does it take so long?
Do you have an SSD?
It may be due to the servers or your internet.
It's just a junk game
Play GTA-Online and you will know what long loading times are.
It's because of Unreal Engine. All games on Unreal Engine have long loading time.