No don't bot 20 hours a day especially if you are woodcutting/fishing or anything with high ban rates. IF you want to bot woodcutting 20 hours a day and it be safer then most. I would power chop willows or trees where there are hardly any people.

Yes, you will be 100% safe botting 20hours a day. I reccomend woodcutting also because it has a very low ban DOnt listen to this guy

Dont listen to this guy ^ woodcutting has a hogh banrate and 20 hours is kind of much. i would say 15 hours a day max the you'll be fine

Apparently , Yes

 

http://gyazo.com/536f646d804ad97afade2b9fa31dd4e8

Dunno if this is still an active question or not.

But botting 20 hours a day will probably get you banned.

I have my fisher set to break every 2-3 hours for 10-30 minutes, and he's been going for quite a while. obviously I stop it every now and then to transfer items or I'll switch skills just to lower that ban rate. But I've gotten several 80 hour proggies in catherby.