Some fish will be attracted right away. But longer you bait an area the more will stack up if the area has good cover like stumps. I feed around stumps and pallet beds on a channel drop. I use 2 - 5 gal buckets almost everyday using scrap feed. When I used dry sweet feed it was day 1 - 50lb sack and then 1/2 sack every day or so. Helps to carry a bucket of feed and scatter handfulls around the boat every few minutes when the bite slows when fishing.

