We did several updates from 5300-05-CSP to 5300-08-01 over network and it usually took us about 30 - 40 minutes per machine.
The download packages also contain more filesets than you need because one never has all available AIX filesets installed.
It should be no problem to go from 05 to 07. Only thing that's important is to make sure you got the correct update package. Usually you can choose your originating package level and the download will contain everything you need to go to the desired level ... Alternatively you can choose from NO LEVEL to TL07SP03 as the safest way to make sure you get everything you need ...
I agree with alt_disk_copy. You can update your system on the fly and "activate" your updated OS with a reboot. This also allows a simple back-out plan as all you need to do is reboot back to the original drives.
This will only work, however, if your rootvg doesn't have active application data/databases on it. As this normally isn't the case though...
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