The average hair growth rate is half an inch/month (1.3 cm). After 3 months (9 weeks) of MSM + a trim I retained 2.2 inches which is 0.7 inches more than the average hair growth retained after 3 months. Not so bad. 

When looking at the result pictures it doesn't seem like much happened, but not only did I retain length. The texture and condition of my hair improved too. 

Right now I am trying to see how fast my hair can grow but there is no way that I will neglect the health of it just to get the length.