Microsoft: Windows 7 upgrade can take nearly a day.

By Emil Protalinski.

A Microsoft Software Engineer has posted the results of tests the company performed to the upgrade time of Windows 7. Worst case scenario is that it will take a bit over 20 hours. But a clean 32-bit install on what Microsoft calls "high-end hardware" should take only 30 minutes.
While developing Windows 7, Microsoft ran many different performance tests to make sure the operating system was an improvement over its predecessors. One of the tests focused on upgrade performance: Microsoft wanted to make sure that an upgrade from Vista SP1 to Windows 7 was within a five percent threshold faster than an upgrade from Vista SP1 to Vista SP1. Microsoft gave three reasons for using the Vista SP1 to Vista SP1 upgrade as a baseline instead of Windows XP to Vista:

Read more.
Microsoft: Windows 7 upgrade can take nearly a day - Ars Technica

 

[ripbox]

Worst case scenario is that it will take a bit over 20 hours..........
Wow.... what did they install that on? a pentium 386? lol
surly no one has a system that slow any more

 

[Slimy]

Worst case scenario is that it will take a bit over 20 hours..........
Wow.... what did they install that on? a pentium 386? lol
surly no one has a system that slow any more

It was because of the amount of data that the install had to move over.