Original estimates represent the anticipated time required to complete the work that's represented by the issue. It is shown as the blue bar under the Time Tracking section.
For you to specify an original estimate value, you need to make sure that the Time Tracking field is added to the issue's create and/or edit screen. We will discuss fields and screens in Chapter 5, Field Management, and Chapter 6, Screen Management, respectively.
To specify an original estimate value, provide a value for the Original Estimate field when you are creating or editing an issue.