Activation (timer) Settings
There are two activation settings available, you can select from either to Active the web cam screensaver

Activate when idle for more than # minute(s)
If you select this setting, your webcam screensaver will kick in when it detects no keyboard activity for a designated number of minutes.

Activate when no webcam activity for more than # minute(s)
If you select this setting, your webcam screensaver will kick in when no webcam motion is detected.
NOTE: see Alarm (motion detection) Plugin which is required for this option.

TIP: If you don't wish to use a webcam screensaver then make sure both options (mentioned above) remain unchecked.

select the check box beside the Activation you wish to use
now select the designated number of minutes (for either), to do this use the up and down arrows to the right of each option. You will notice the # of minutes will increase / decrease as you scroll through the minutes available (1 minute minimum - 120 minutes maximum)