I really don't see the need to have a new release every 6 months. Maybe the developers get bored :-), but as a business user I don't like upgrading so often, Also presenting a stable environment for commercial software vendors is 'a good thing' imho.
For your purposes, then, the important number is 18 months--that's how long they're promising support (in the form of security upgrades) for each version, so that's how often you'd probably end up having to upgrade.
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