On average, when setting up new server, we spend around $400 USD per server configuring Linux, Settings, Optimizing, Hardening, Installations, Updates, DNS, Email and so on. However, if you're work isn't just basic straightforward setup with some of the aforementioned then usually once it has been set up you don't have to do it again for about a year and sometimes longer.
We have work done every 6 months on our servers but its not absolutely necessary.
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