Active Downloads

You can indeed and with no need to be signed in on the site.

Press the Guide button, go to the Settings blade and select System Settings.

Choose the top option of Console Settings, then Startup and Shutdown.

Here pick the last on the list of Background Downloads and Enable it.

Then just press the off button on your console.

This will let your console download in what is essentially a standby mode and when it is complete, the console will turn itself off fully.

Do you know if all games take forever to download on the  Xbox or is it something to  do with my network. All of my down loads have taken a long time but this is rediculous it's been 8 hours and its at 22%! what can I do to make it go faster. The game is only like 4.75GB and I still have 208GB of space left .

I've downloaded Mass Effect, which is over 6gb, in a touch over two hours.

Your problem could be that you simply don't have a quick internet connection. Someone else in the house who uses the internet could be chewing up bandwidth as well. If you are connecting via wireless you could be getting interference.

It's pretty much impossible to say for sure without more information.