Ya my big female anaconda is almost 12' and just over 30lbs, and she's on a rabbit every 2 weeks and she acts like she wants more haha. But she's also a pretty sedentary snake unless she's out and about, but it's breeding season and locking constantly so I haven't been handling her. It is really a case by case thing, and there is no golden rule to follow.
Just feed appropriate sized meals, and look close, they will let you know when they are hungry. Most of this hobby is observation of your animals, reading, and understanding what they need.
I like my Dubstep to go Wop Wop Wop Wop