When I first got my feeder, I was thinking a bag a month max. I was running about a bag thru the feeder, and hand throwing a bag plus a month because I enjoyed watching them feed. Finally I just set the feeder to throw what I was hand feeding so it would be more consistent.
The beauty of feeding, is you could feed at the same rate as me for a 1/4 the cost, since is is based on surface acre. That is an advantage to a 1/4 or 1/2 acre pond when it comes to a feeding program.
When i started my pond project I was wanting a 6-8 acre BOW, till I figured out the construction cost. Now, I know that size would be 3x the cost for construction, in buying fish, habitat that had to be placed, and feed that would thrown. In BOW bigger isn't always better.