How long does it take to install Windows Phone 7 SDK

I started installation of Windows Phone 7 SDK from this link over my machine

- Windows 7

- x64 dual proc

- 2GB RAM.

- Visual Studio 2010 professional

- Office 2010.

The download of 322 MB completed fairly quickly. The installation took more than an hour. Phew!!! Even my OS (windows 7) installation was quicker than that.

I hope this experience gets improved. Anyways now I shall write my first app :).