Fsr, I thot it was 100 weekly training points and hence calculated for the worst case scenario.....(since thats the amt of time you d have to wait be4 u know if sp/st has maxed out.)

Anyhoo (since the distribution is not known)
With no fitness coach/ center and no focus on, the training points that get allocated to strength/speed > (8+.5TW).15 = 1.2+.075TW .....in the worst case scenario. A player with TW =20 would take more than 50 weeks for speed/strength to increase. So dont bother if your player has maxed out on fitness if you dont have supporter/ f center and coaches.

Assuming uniform distribution
Points > (10+.5TW).33 = 3.3+ .165TW
Wait 16 weeks if TW=20
with a maxed out fcenter(20% extra points )
Points> ((10+.5TW).33)1.2 = 3.96+ .198TW
Wait 13-25 weeks for TW=20 - TW =1
with a maxed f coach (20 extra points)
Points > ((10+.5TW +20).33) = 10/3+.165TW + 20/3 =10+.165TW
Wait 8-10 weeks for TW=20 - TW =1
With both f coach and f center maxed out
Points >(10+.165TW)*1.2= 12+.198TW
About 7-8 weeks for TW=20 - TW =1

But if you need to check just speed / strength and you use "focus on" the no of weeks get halved.(consistent with TheFreakingstud's fitness pop periods with focus on)

Then again these calculations could be erratic lol