Is there any way to estimate the amount of time a LEM upgrade on a standalone appliance will take? Specifically we're going to upgrade from 6.3.1HF7 to 6.4. I'd like to give my support teams some estimate of downtime. I can reasonably estimate the time it will take for agents (~660) to upgrade, but I'm primarily concerned about how long of an outage the appliance itself will be down.
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