I think 50% is training and time westing because most of the skills need 2 weeks to pop and if you go for only 50% that means 4 weeks for single skill pop, you may get side skill pop but you won't get enough from your training. make sure that your trainees get 48 minutes because even if they get 43 or 45 minutes they won't pop easily as you have got 14 weeks in a season.