How long shall migration from Vista to Windows 7 take using MS Migration Path?

How long shall take migration from Vista to Windows 7 using MS Migration Path? Microsoft revealed it's lab times estimation.

Upgrade times were obtained from lab machines in three different configurations:

• low
• mid-range
• high-end

with three simulated types of users differed in the amount of data and the number of applications that were on the PC before the upgrade to Windows 7:

• medium user (about 70GB of data and 20 applications)
• heavy user
• super user (about 650GB of data and 40 applications)

The slowest 32-bit upgrade (a super user on a mid-range machine) took 20 hours and 15 minutes while 32-bit upgrade for medium user - between 1 hour and 40 minutes and 2 hours 50 minutes.

More detailed Microsoft's time estimations could be found in Hernandez's blog

(*) - Microsoft did not test Windows XP-to-Windows 7 upgrades, even though a clean install is the only upgrade path between those two operating systems.