Depends on your ISP's speed. I'm running around 64mbps and it looks like I'll clock in the update at a total of one hour, with the timer jumping around from 2 to 5 back to 2 but with a total of one hour at the rate it keeps refreshing itself.
As I typed this it went from 7 minutes to another hour and back to 10 minutes lol. Make sure you have no applications running in the background, disconnect other devices from your internet and just wait. It will be there for you.