The basic action of fly casting is to stop swinging the rod, pause and wait until the line is fully extended, then move your hand to bend the rod again, and stop again. However, when using a long tippet, it is important to imagine that the rod is constantly bending. (Higashi)
There is a pause in the hand movements when handling a long tippet. However, it is much shorter than the standard. In order to handle a long object neatly and stably, the basics are bent and the timing is slightly changed.
When making a long-distance false cast on a lake, a pause is strictly necessary until the line is fully extended. In Japanese rivers, this should probably be around 5-8 meters, or at most 10 meters. I think it's fine to start moving the line in the opposite direction when the line is fully extended, or even a little before that. Before the line turns over, the tippet is perfectly taut in the air thanks to the air resistance of the fly. This stable state, without any unwanted slack, is extremely valuable and crucial for accurate presentations. Once the line becomes slack, it's difficult to regain control, and there's no way you'll be able to get it where you want it.
