I'm not sure it manages well the switching of this option on/off for a single game.
In case of accident, edit your save game.
The principle of "daily progress" sounded good, but having to check every day if a new soldier had a breakthrough (in order to push a new fresh studen in psi school) is not so fun.
Note that if you use this option, the "average time" of initial training is (much?) more than one full month.