Don't use timer event to depict expected activity duration
Use text annotation and/or task properties to show expected activity duration.
Use attached timer to show what should be done if the activity lasts longer than allowed.
✔ How to
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✘ How NOT to
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Notes
Soft expected task duration shoud be distinguished from a hard deadline:
Expected activity duration is the desired task execution term. It should be realized that due to the stochastic nature of work exceeding the expected duration isn't not something extraordinary and does not require any action. (If the expected duration is never exceeded then it means that it's set too large.) Specify the expected duration in activity properties and use a text annotation to depict it at the diagram.
On the countrary, exceeding the deadline entails certain consequences, e.g. if the tender deadline has been execeeded, the work should be cancelled. Use attached event and a sequence flow to depict this scenario. Attached event without outgoing flow is syntactically icorrect.
Author(s)