You can change the application idle threshold for a monitoring profile, under its Application settings:
Click the Gear icon near the top right corner
Select Monitoring Settings
Select a monitoring profile
Click the Gear icon at the right-side of the Applications object.
You can specify the idle time in the IDLE TIME THRESHOLD (MINUTES) field.
To learn more about Application settings, check out the Monitoring Settings > Editing Applications Settings section on the Teramind User Guide.