How long does it take to manually install Service Pack 1 (SP1) on Windows 7?

NOTE: The ISO for SP1 was used.  Not Microsoft Update.

Yesterday Microsoft released Service Pack 1 for Windows 7/Windows Server 2008 R2. I know in previous service packs it warned that it could take an hour to install. I was wondering how long it actually takes.

More about Windows 7/Windows Server 2008 R2 SP1

I grabbed two notebooks, well actually a notebook and a netbook. Below are the specs of each.

Hardware Notebook Netbook
Disk 500GB 7,200RPM 250GB 5,400RPM
Processor Intel I7-720QM Intel Atom N450
Memory 8GB, 1333MHZ, DDR3 1GB, 677MHZ, DDR2
Disk Encryption Windows BitLocker TruCrypt

The notebook is running Windows 7 Enterprise 64bit.
The netbook is running Windows 7 Starter 32bit.

Both test machines were up-to-date with current updates so their starting points were the same.

I started a stopwatch when I double-clicked the service pack file and stopped it when I was able to log in. Below are the results.

Work Notebook 58 minutes 45 seconds
Personal Netbook 100 minutes 44 seconds

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