Let's say they totally ignores breaks and only looks at what you are doing while logged in? I don't see any reason for them to look at how long people take breaks inbetween their runescape activities?
I've seen many people getting banned doing bots only like an hour per day but probably not doing anything else in between. I only got banned once on the bot-nuke patch a long long time ago and I never bot more than 2 hours in a row even with huge break in between.
For example:
Day 1: 2 hours agility botting -> 8 hour break -> 2 hours agility botting
Day 2: 2 hours agility botting -> 8 hour break -> 2 hours agility botting
Day 3: 2 hours agility botting -> 8 hour break -> 2 hours agility botting
= 1x 12 hour agility botting with high risk of getting flagged
But:
Day 1: 2 hour agility botting, 3 hours legit slayer, 2 hours agility botting and any quest
Day 2: 2 hour agility botting, 1 hour legit thieving, 1 hour legit woodcutting, 2 hours agility botting and any quest
Day 3: 2 hour agility botting, 3 hours legit slayer, 2 hours agility botting and any quest
= 6 x 2 hour agility botting with very low risk of getting flagged