**As** a Begin of the insertionProject Portfolio Manager

End of the insertion Begin of the deletion lifecycle manager
End of the deletion **I want to** Begin of the insertioncreateEnd of the insertion Begin of the deletion plan lifecycle steps based on duration
**so that** I can plan independently from the dates, e.g. 

* forEnd of the deletion project templates Begin of the insertionwhere project stages and gates alreadyEnd of the insertion Begin of the deletion that get instantiated.


This feature only partially fulfils the user story since the duration is not yet an independent field. This will be done within ###59180. 

**Acceptance criteria**

* Stages receive a duration.

* It is a separate field in the database.

* The duration will be calculated for now (`end_date - start_date + 1`)

* Gates don'tEnd of the deletion have a Begin of the deletion duration.

* Another way of seeing it: TheEnd of the deletion duration Begin of the deletion is always 0

* The duration is displayed as a column in the project life cycle administration table.

* For now the duration is read only. It will become editable via ###59180


**Permissions and visibility considerations**End of the deletion

Begin of the insertion**so that** IEnd of the insertion Begin of the deletion * Users having the "View project stages and gates" permissionEnd of the deletion can Begin of the insertionaddEnd of the insertion Begin of the deletion seeEnd of the deletion the Begin of the insertionspecific dates later once itEnd of the insertion Begin of the deletion duration.


**Out of scope**

* Duration columns in the project list

* Duration filters in the project list

* DurationEnd of the deletion is Begin of the insertiondecided whenEnd of the insertion Begin of the deletion not displayed inEnd of the deletion the Begin of the insertionproject starts.End of the insertion Begin of the deletion overview pageEnd of the deletion