I apologize if I'm wrong, and please correct me if I am, but from everything I've read, 47 minutes training is the same as 20 minutes training................ anything short of 48 minutes is just random training percentage.
Kinda hard to explain it, but to try to simplify what I'm saying, alll players with 48+m get full training, while anything less than 48 just gets a random percentage of what 48M brings.
I'll try to find this in the manul and post it here.