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Sum of the total elapsed time for all instantiations of an activity in the event log. Also known as cycle time.

Event log is associated with a process in which the total elapsed time of activity instances is of relevance.

Minimizing lead time is desirable.

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actinst
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time
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Formula for practitioners

$\sum_{i \in \mathit{inst}(a)} \mathit{LT}(i)$

$\mathit{inst}(a)$ returns the set of activity instances that belong to activity $a$.
$\mathit{LT}(i)$ returns the lead time of activity instance $i$.