This is the reason my blog is devoted to having fast disk I/O.
Here, I am copying some virtual disk images, ISO linux distros and some virtual appliances.
2,3,13 hours to copy files to a spare 32GB Lexar USB stick.
I have old Dell servers and many retired PCs that don't have the luxury of USB 3, Thunderbolt, eSata, or even Gigabyte ethernet.
The same copies on my macbook to an external SSD would probably take 15 minutes.