I have to say that continual training on the odd occasion has been pleasurable. There is a POT Principles of Troubleshooting class I took about a decade ago that is common with many airlines, I had a good time and actually walked away feelin a bit smarter. We do gen fams /systems classes/ factory classes that run from a week to several months here on type aircraft. I have found that I generally get more out of the class if I have worked on type for atleast 6 mos first and that retention is about 10%, anything longer than 2 weeks is a waste.