I understand there's already a topic on this, I find it somewhat difficult to understand. Please understand that using breaks is an important part in keeping your account unbanned.
More information on how to bot smart -> http://osbot.org/forum/topic/6894-bot-smart-what-it-is-how-to-do-it/
Defining the parts of a "break"
[Average Interval] - The "average interval" is the average time between breaks. It's an "average" because of interval deviations, which i'll be getting to in a moment. This is how much time will be in between your breaks on average. [interval Deviation] - This is a very important part of making sure jagex doesn't notice a precise pattern in our breaks. Lets say your "average interval" is 75 minutes, and your "interval deviation" is 10 minutes. This means that the time between your breaks can be anywhere from 65 - 85 minutes. [Average Break Time] - The "average break time" is the average length of the breaks your account will be taking. It is an average, because there are also break deviations, which I will get to in a moment. Your "average break time" should be how long you want your account to stay logged off per break on average. [break Time Deviation] - Break time deviation is very similar to "interval deviation". Your "break time deviation" is how much the length of your accounts break can deviate from the average time. Lets say your "average break time" is 20 minutes and your "break time deviation" is 5 minutes. This means your accounts breaks will be anywhere from 15-25 minutes long.
Here is a picture of my break setup
Please be sure that you have the "enable breaks" box selected.
Now, let me explain how breaks work going off of my break setup.
My "average interval" is 75 minutes. my "interval deviation" is 25 minutes. This means that the time in between my accounts breaks can be anywhere from 50 - 100 minutes.
my "average break time" is 25 minutes. My "break time deviation" is 10 minutes. This means that the length of my accounts breaks can be anywhere from 15 - 35 minutes.
If you have any more questions, please feel free to ask below. Drop a like on the post if this helped you!