Comming from a guy whos been swing for steelies for 20 years, never hooked one on a bobber and jig, The take is going to come when you have your fly properly positioned in the water for some people that happens quickly in the swing some it happens later. the other key part is the water that you are attempting to fish. If your casting to 20ft of water and where your standing is 4ft your prob going to hook up closer to the bottom of the swing, if you are fishing a flat where the depth is pretty constant but are fishing more rocks or depressions the take can be high. It still comes down to being able to present the fly properly, the best analogy i give my clients is do everything you can to present the fly as closely to the way a boat presents a plug. Big bellies in your line at the top of the swing will typically gurantee no fish high and if not fix quickly in the middle. Hope this helps.
P.S. its in the hundreds of fish.