Slack is the delay available before an activity’s latest start is reached.
| Input | What it means |
|---|---|
| Earliest start time (EST) | Elapsed time or duration in the unit selected on the form. |
| Latest start time (LST) | Elapsed time or duration in the unit selected on the form. |
An activity with earliest start day 4 and latest start day 7 has 3 days of start slack.
Use the formula and worked example to check the relationship between the input and output before carrying the result into a longer calculation.
Keep the original input precision through the calculation and round the final answer to the precision you need. Rounding an intermediate result can change later steps.
Check the operation, units, signs and rounding first. Equivalent fractions or expressions can look different while representing the same value.
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