How configure advanced roadmaps to show working days on schedule items

[Steve Chadbourne]

The work items on the schedule in advanced roadmaps have the number of days displayed.

This shows calendar days and we want to show working days.

We have specified our working week on the board that the roadmap is generated from.

How do we show working days on the schedule?

[Anh-Vu Mai-Nguyen]

Have you found the way to show it? 

If yes, please show me how to do. Thank you very much.