It appears you esteemed gentlemen are talking more about the training that would be required of the typical RFDS PC-12 pilot. Yes, the typical candidate could indeed be trained in 3-4 weeks, but how many of you would then be prepared to send him out on a back-of-the-clock trip, as a single pilot operation, in poor weather?
There is a certain amount of "jet like" experience you would want him to have gained first. Experience comes from mistakes, but mistakes take time.
Merry Christmas, by the way, to you all.