You can filter out weekends, holidays, and other times during which your team might not be working on your board's project(s).
To specify working days,
If your team has a different time zone to the server, select the team's Time Zone.
In Standard Working Days, select all the weekdays on which your team typically works.
In Non-Working Days, click Add Date to specify holidays or one-off dates on which your team will not be working.
To remove a Non-Working Day, click the 'x' next to the date (see screenshot below).
Screenshot 1: the 'Board Configuration' screen — 'Working Days' tab