total restore to factory setting and updates again - how much time to estimate per pc?

if you have to totally undo win7 (restore to factory) ~ data already backedup~ and put new updates on the machines, how much time would you estimate for one PC, with reasonable hardware. (the backups do not have to put back). Basically it will become new machines.
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Dave BaldwinFixer of ProblemsCommented:
I just did a factory restore on two HP G62 laptops with Windows 7 64-bit from their restore partitions.  The initial restore took about an hour.  The next day there were 100 updates to install.  The day after that, there were 213 updates to install.  I think Service Pack 1 was in the first bunch and IE11 was in the second bunch.  And no, you can not install them all at once because the second batch of updates is triggered by the first batch.  Not counting the fact that I had to do a FixIt to get SP1 to install on one of the machines, it took 6 to 8 hours spread over 3 days to get it all done.  I also had a problem when installing the 213 updates because one machine kept saying it was running out of memory (3GB ram) and it took a lot longer because apparently it was swapping a lot to get it done.  You might not want to do all of them at once.
25112Author Commented:
hmm.. ok.. so the basic restore is a simple process.
and updates comes in 2 batches.. but they could run into issues with SP1 or hardware faults, right?

does all updates have SP1 issues or only selective machines?
There many factors that determine the time used. One is the age and speed of the PC, another the speed of your internet connection (all the updates will be several 100MB's that have to be downloaded). Or if the factory image already includes the Servicepack or not (the SP installation alone can take an hour or more, depending on the hardware). Besides that, it is also possible that the recovery image already includes some updates. So it also depends on when the PC was built and with what included. Basically it means that the older the PC, the longer it will take.
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"total restore to factory setting and updates again - how much time to estimate per pc?"

restore to factory settings takes 1-2 hrs.
updates can take a long time depending on your hardware and internet connection.
"how much time to estimate per pc?" ... cannot estimate time, can only guess it will take hrs.
Allow four hours.  But as mentioned there are many variables.  As mentioned, is SP1 on the installation disk.
Dave BaldwinFixer of ProblemsCommented:
SP1 was not in the factory restore image for my machines.  It is a requirement for the second set of updates.  Unfortunately, it is possible for the restore image to be corrupted.  It appears that was what caused me to do a repair to get SP1 installed on one of the machines.  While most of it will probably go smoothly, you do have to check and see if there are any problems.  I had several apparently minor updates that would not install.  The machines appear to run fine now.
Dave BaldwinFixer of ProblemsCommented:
And by the way... two 'identical' machines are Not identical.  The differences start occurring from the moment you turn them on.  My two laptops were supposed to be 'identical' but they clearly were not.  I was there when they were originally purchased.  They were in boxes side by side in the store.  That was probably the last time they could have been considered 'identical'.
25112Author Commented:
ok.. thanks dave
interesting.. is there a logical explanation why they behave like thumbprints (unique!)
25112Author Commented:
rindi,mike,jcimarron- thanks for explaining the variables to be prepared for..
Dave BaldwinFixer of ProblemsCommented:
Timing is the first thing.  As different softwares get installed, they are always at a slightly different time and with different data on each computer.  If you install software that includes some update, then even the Windows updates will not be identical.  It's all kinds of little things like that.

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25112Author Commented:
thanks all! that was good estimation and factors!
Glad to have helped.
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