I would tend to agree that using a normal daily inject schedule (eg 4iu ed) 12 weeks would tend to be on the short side since gh takes a long time to accumulate noticeable results.
However, if you were to use the gh bulking method which is to inject your weekly amount of gh spread over 3 pwo injects you will notice a rapid increase in benefits.
So instead of doing 28iu per week if you were doing 4iu per day, you would just do 10iu pwo in 3 shots for the week. That way you still do the same overall amount of gh per week but this method has worked well for so many guys when doing shorter gh cycles, and especially while bulking.
I will warn you that water retention is troublesome in those prone to it, but will dissipate as the body tries to achieve homeostasis.