Well for the less fortunate minds, You could give the definitions Jad provided when you hover the mouse over said setting
Average Interval:
This is how long the script will run before taking a break. So if you set this to 60, your script will run for 60 minutes before breaking.
Interval deviation:
This allows you to set a deviation from the average interval. Say our average interval is 60, if we set the deviation to 10, then the script will run anywhere from 50 to 70 minutes.
Average break time:
This is how long the script will be on break. If we set this to 30, then your script will break for 30 minutes.
Break time deviation:
This allows you to set a deviation from the average break time. Let's say the break time is 30, and we set this deviation to 5, this means the script will break anywhere from 25-35 minutes.