The difference between the LST and EST is called slack.

Name: The difference between the LST and EST is called slack.
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Slack is the amount of time that a task in a project network can be delayed without causing a delay to subsequent tasks or the project completion date. LST (Latest Start Time) and EST (Earliest Start Time) are used in project management to calculate slack by finding the difference between them.

The Difference Between the LST and EST Is Called Slack