A metered Internet connection is a type of data plan used by some Internet service providers. With this type of plan, providers charge you according to the amount of data used (the amount of data sent and received by your PC). These plans often have a data limit, and if you exceed the limit you might have to pay extra, or your connection speed might be reduced for a period of time.
Windows 8.1 is a large file: about 1.8 GB for the 32-bit version and about 2.3 GB for the 64-bit version. Windows RT 8.1 with Microsoft Office is about 1.7 GB. Before you start downloading either of these files using a metered Internet connection, make sure to check your current data usage to see if this download might result in additional charges.
Most people with a broadband Internet connection will complete the download in an hour or two, but download times will vary based on your PC, your connection speed, and other factors.
In general, it should take about the same amount of time as downloading a movie from the Internet.
Make sure you allow enough time for the download to finish, and don’t turn off your PC while it’s downloading.
For more about metered connections, see Metered Internet connections: FAQ.