The 64-bit Windows 8 Pro upgrade ISO file is 2.69 GB in size, so you'll be looking at around 35 minutes or so at your full speed. Longer, if your ISP or the download site is not operating at full speed.
My ISO x64-bit file was 2.63GB, and it took about 10-15mins. Used to have Windows 7 Ultimate x64-bit. So far I really enjoy the new OS. Much faster and fun, although trying to locate some apps and services and dock them to the taskbar could be a pain
Thank you all,
I downloaded the Upgrade file and installed last night and it took about 3 hours from start of download to finishing the install.
I am now going to take probably a lot longer to learn how to use it.
Like the look of it so far though.