Major Release support term

What would be the support window (years) for a major version of Octopus deploy? or is it based on a number of major versions released?
If so what the expected road map for major versions?

Hi Richard,

The support period of your license is 12 months. During this time you have access to all major, minor and patch releases.
After your support period ends, you will have perpetual access to patch releases for your current version.
However, we generally only release patches to older versions for 12 months from the time the version was released, and only for security-related issues or critical issues which would significantly impact the functioning of the product.

I hope this helps.