How long did what take? Learning the essentials of OpenBSD, budget 4-6hours. Switching over servers from Ubuntu, an hour for the first one then 10mins each after that. You can copy config with your favourite tools; most have ports for OpenBSD already.
If you want to learn more in-depth, read: Michael W. Lucas
Absolute OpenBSD, 2nd Edition: Unix for the Practical Paranoid. Highly recommend it as teaches many fundamentals most software engineers skip.
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How long did what take? Learning the essentials of OpenBSD, budget 4-6hours. Switching over servers from Ubuntu, an hour for the first one then 10mins each after that. You can copy config with your favourite tools; most have ports for OpenBSD already. If you want to learn more in-depth, read: Michael W. Lucas Absolute OpenBSD, 2nd Edition: Unix for the Practical Paranoid. Highly recommend it as teaches many fundamentals most software engineers skip.