Well that would depend on the configurations the server requires. For example an extra Hard Disk usually takes say around 30-40 minutes.
However, if this is an upgrade to higher package this requires more time. We generally provide a dedicated server in 24hrs after the payment has been received. Although a custom server may require couple of hours extra for the setup. Since we also manage the migration part free of cost for our clients this adds up to the task, how much time this may take depends on the size of data the server has.
I would like to add that the websites face no downtime as we keep them running on both the servers until we get a conformation from the client to cancel the old server.
We keep getting requests for server upgrades and I can say the process has been absolutely smooth for all our clients.
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