That is a really long time. as others have said download speeds are dependent on internet connection. I use a powerline adapter for my HTPC, PS4, PS3 and XB1. .
I also have a 150mbps internet connection. Withcher 3 took me a little over 2 hours.
The PS4 does have faster load times, than the one, and it also allows you to download numerous files at once. But I'd advise against that.
Both systems however don't need to load the full game before you can start playing it, I believe it's ready to play when it hits the 20% mark.
If you can, change your settings to download the game to an external hard drive USB 3.0 is faster than the SATA 2, which is what the PS4, and XB1 connect their HDD with.
EDit:
This is the one I use, as you can see it can handle numerous devices in one area. This is how I have my HTPC, PS4, XB1 , and PS3 connected. The WiiU can only connect by Wifi, otherwise I would use it for that.
http://www.amazon.com/ZyXEL-Powerline-Gigabit-Wall-plug-PLA4225KIT/dp/B0061308MA
