The cycle time is the time it took for a story to go from the started state to the done state (accepted in this case).
We compute this by adding up all the time a story spent in any state that is not considered as done from the moment that story is started.
For example, here is what would count by default:
You can keep track of this metric, by using the cycle time chart and the average cycle time.
To learn more about how the cycle time KPI can help your team become more efficient, read our blog post.