Not Quite Ready

I've read that these herons are nestlings for 25 to 35 days. Well, today is Day 35 for this family, and they don't seem to be in a hurry to leave. One of the five at least found his way down from the tree to my roof, but hasn't been down to the ground yet. Will they stay here as long as Ma and Pa Heron keep bringing them food (regurgitated crabs)? Will Ma and Pa suddenly stop bringing food, and then the kids will have to follow them to the creek?