Always remember:
age, minutes, size and trainer level affect the training they get
when you train 2 positions you can say at a rough estimate:
1 up takes 2-4 weeks
for 18y, 48min played on position,5'9 guard or 7'6 Centre, trainer level 6:
each 2 years older: +1 week
each 2 steps bigger(guard) or smaller(C): +1week
each 2 trainer levels: +1 week
45min instead of 48min (93%): 85% training
36min instead of 48min (75%): 50% training
The values are very roughly guessed, just to show you the effect and that it needs several weeks to receive a popup .