Glad rag, I did 12 months initial training to qualify as a propulsion tech, then did 7 weeks of Herc Engine & Prop Q course, a week propellor dynamic balancing course (including vibration & harmonics analysis), 7 week rigger conversion course, 7 weeks of Herc Airframe Q course, numerous other courses of various duration for line training, ongoing training etc.
What you cannot replace is working with people who have years of experience, I learnt off some very very good engineers, with years of on type experience. This is what will be missing in a few years time, just before I left the service, there was a growing problem that most people on shift had less than 2 years experience on type.