Windows Upgrade team have tracked Windows 7 upgrade performance using Vista as baseline comparison, designed to measure total upgrade time simulating different user profiles (with different data set sizes, number of programs installed and settings) against different hardware profiles. The goal was to determine whether an upgrade from Vista SP1 -> Windows 7 was within a 5% threshold faster than an upgrade from Vista SP1 -> Vista SP1. And reports that the maximum amount of time that a Windows Vista SP1 to Windows 7 upgrade can take is 1,220 minutes.
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