Those screen choices are like the choices in the Map Matrix, and in the written instructions for that, it explicitly says to use the duration at .050" lift. Which makes total sense for the numerical choices listed. So the middle selection it is for your cam: 210* to 230*.
You're just putting in some baseline info for the system; it is probably going to one of several libraries of maps depending on the value selected, to give the system some sort of calibration on the manifold pressures it should 'learn around'.