Generally speaking, an appliance upgrade doesn't take very long - I would say around 15 minutes or so, but you could allow 30 minutes to be safe. You can upgrade via mounting an ISO to your hypervisor or extracting the upgrade zip file to a network share, all steps are listed in the LEM Upgrade Guide. Worth noting that LEM 6.6 shipped earlier this month and I'd recommend upgrading to that version. However, you will need to upgrade from 6.3.1 -> 6.4 and then from 6.4 -> 6.6.
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