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The internet never sleeps, therefore hosting companies should have a back-up plan to deal with problems 24/7/365.
I would expect that at most, your system should be back up and running within a few hours.
All large data facilities have emergency generators and redundant systems. If you ensure that your host is located in a facility like this, you should expect to not be down for long at all.
In five years, I don't think my server has been down more than five times, and even then it was back online quickly.
I have even switched servers, due to upgrades etc, and there was no down time. Due to pre-planning the switchover was seamless.
ADG Webmaster
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