Sep 30
In case you have a copy of Windows Vista Service Pack Beta 1, below are the things you should know:
1. It usually takes 45 minutes to 1 hour and 15 minutes depending on a number of factors like hardware, applications installed, available memory and as such.
2. It makes three reboots
3. You should have at least 7 GB of free hard disk space
4. The first 30 minutes of installation would usually be for Windows Vista preparation and during that time you can still use your PC.
5. There is no timer for the installation