The bottom line is that there needs to be a way to train SF's while being able to play at SF. It does suck that they train slower in both outside and inside skills, but it could be compensated for with a special training. Maybe even limit it to 1 pos SF training that trains a lot of things really slow.
JS 4-5 weeks
OD 4-5 weeks
ID 4-5 weeks
DR 4-5 weeks
HN 4-5 weeks