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You can choose which unit to use when estimating issues in your plan. Estimation for issues can be based on time (hours or days) or story points.
To change the estimation units in your plan:
In the Scheduling tab, select whether you’d like your plan to be estimated in Hours, Days, or Story Points.
Story points and time-based estimates (hours and days) are not interchangeable. For this reason, changing this setting will erase any issue estimations not already saved to your issues in Jira.