The time it takes to download 50 GB of data depends on how fast your internet speed is.
My internet speed is 10 MB per second download and it takes me 10 hours to download a 50 GB file so I let the 50 GB or larger files download to my desktop computer overnight or when I'm away from the computer.
If you have a faster internet speed then it may only take you an hour at 1 GB per second to download that same file.
The faster your internet speed the better and the faster the file will download.
I wish I could get a higher internet speed but there's not higher internet speed right now in my area.