You can get the sum column's time data by grouping statuses.
Adding new statuses group
To add new statuses group click Configuration
Click + Add new statuses group
First of all, add a name to your group and select a project to monitor. Then, select statuses on which the timer should start and stop the calculation.
You can also choose a status on which the timer should be on pause.
After you customize your calculation preferences, set the Warning and Critical time limits
This feature will help you to get the visual colour tagging on issues to notify when the time limits have been exceeded:
Warning time limit - yellow
Critical time limit - red
Managing statuses group
To manage statuses group click Configuration
After entering the status group manager, you can manage the group.
Displaing statuses group on the dashboard
To select the group status to be displayed on the dashboard, click Status Group and select the checkboxes of all the group statuses you want to display.