Xbox One Installation times.

Its all about your connection speed. Pretty much all Xbox One games have a game update when you first install them. These updates can vary from a few hundred Megabytes to several Gigabytes. The console will always download the update first before installing
the data from the Blu-ray game disc. If your connection speed is low, it may take some time to get the update.

If all you want to do is play single player, disconnect your console from the Internet, install the game disc and play while still offline. You can install the game update later. If you set the console to 'Instant On' game updates will download while the
console is in a low power state.

Its the same with downloading full games from the Xbox One Store. Xbox One games vary in size from a few hundred Megs (Minecraft) to 50GB + for Halo MCC.

Not had any slow downloads myself, but then I'm on 120 Mb/s (megabits) connection from Virgin Media.

50 minutes is good, especially done wireless. It will be slightly quicker wired.

Its all based around your broadband connection. I live out in the country so only receive a 4Mbps broadband speed. My full installation of Fifa 15 took around 18 hours, so count yourself lucky!

Lol 50 mins is quick !! There's people on here with poor internet connection where it takes 10+ hours to download !!

5 -6 hours would be the correct time to download 12gb on 4mb, but not everybody gets there full speed, even to Microsoft servers, also if anybody else is using your connection that will slow it down to, even if you have devices connected but not using it,
also if you wireless there will be an over head for that also.

It is quick but the files its installing are much bigger...it does get frustrating...maybe get an external drive with a quicker read write speed