Fortnite download takes forever?

I've been loading Fortnite for 14 hours but it says the whole time it is checked I always have to wait 1 hour until it e.g. Increases from 90% to 91%. Why is that? The fact that it takes so long to download is only the case with Fortnite.

Because your HDD only reads 3mb / s and your download may be low

Here the whole game file is read and checked again, and with 3 MB / s at 70 GB it takes a very long time.

If your hard drive is really that slow, I don't think the game will be playable on it

How can it be that the hard drive only reads 3 Mb / s? According to CMD, the hard drive reads 63.74 MB / s. Could it be because of the Epic Games Launcher?