You can specify your working hours and days to match when your team is actually working. This can then be applies to the timing metrics so that the time outside the working hours is excluded from the metrics.

You can find these settings at Account Settings under the main menu.

Once you have set the working hours, you can apply to use them in the charts.

For example, in the Timing Insights, weekends and evening time are included in the calculations by default. To change that, click the Settings button on the top right:

In the settings modal, change Tracked time to Use working hours only.

Now all the timing metrics shown under the Insights ➔ Timings tab include only the time spent during the office hours.

You can also choose to only include working days on the Burndown chart by checking Exclude non-working days in the chart editor. When doing so, the ideal burndown is flat during the non-working time (e.g. weekends).

You’ll find the same option in the custom charts when you select Time in state as the metric for the chart.