[demasoni]

Contractions are highly personal and can vary widely from person to person in terms of how early you get them, how long between contractions, how strong they are, if you get them at all etc.

In terms of comparing dyn distances with cwf distances, I think you become better at what you train. Some divers have a longer cwf distance than dyn and vice versa. It's hard to approximate for example, if I get contractions at x distance in dyn, then that's what I should expect going up and down. Depth presents other factors that you won't have in a pool obviously, like equalization, squeeze, changing partial pressures, narcosis, and others. Take a look at the results of comps in the pool disciplines and then the cwt disciplines and see how much they can vary even between the same athletes.

I guess to answer your question directly, there is no right answer or "should be." One could say that a 100m dyn should be the equivalent of a 50m cwf, and that they should feel the same, but that's just a very general statement.