Instances are constantly booting up because most instances live <30d. Boot time in terms of how soon a node is fully booted and joined to the EKS apiserver and ready for workloads is approx 2.5-3min. There are lot of parts involved in getting to this point though, some of which would not matter if you're not using EKS. Also this is not something we measure super closely as from a user perspective it is generally imperceptible.

A possibly better metric for your particular case (assuming you're interested in fastest bootup possibly achievable) is from our self-managed github-actions runners. Those boot times are in the 40-50s range. This is consistent with what others see, as far as I know. A good blog on this topic - including how they got boot-to-ready times down to 5s - that you might be interested in from the depot.dev folks: https://depot.dev/blog/github-actions-breaking-five-second-b...