I trained 3 players with a level 6 trainer during 8 weeks. I trained only PG in pressure:
1) 18 year old, 190 cm. He got 40-45 minutes most of these weeks. Popped week 1, 3, 6 and 8 in OD and week 2 in ID. Started with respectable OD.
2) 21 year old, 183 cm. He had at least 48 minutes for most of these 8 weeks but not all. Popped week 2, 4, 6 and 8 in OD, week 4 in ID and week 7 in handling. Started with proficient OD.
3) 23 year old, 188 cm. He had about 46 minutes most of the weeks. Sometimes a little more and rarely less. Popped week 2, 4 and 7 in OD and week 8 in driving.
My conclusion from this is that you get a punishment for training less than 48 minutes but that it is still much faster than training 2 positions for these players. Player 1) had one week but about 40 minutes and during that week he should have popped according to pop every second week but still low punishment. Also interesting that a 21 year old player popped as frequent as the initial time suggestion in this thread.