I expect to catch about 10 or 15 fish on just one fly but what I expect and what I get are often two different things . Especially when dealing with toothy critters like Mayan Cichlids and Oscars or maybe Pickerel and Gar. I am always amazed at how much damage even a Bluegill can do to a fly. So I try to make my flies as durable as possible and by durable I mean adding a drop of cement or other glue at the material tie in points, a whip finish, and a cemented head, all where possible.