i think if you just stretch for the 6 months and not measure, have the right determination and visualisation you will gain more. Let your body show you the signs instead of a ruler, like DLD always says just do the work and expect the gains. That Is what i am doing if he did 600 do 1200 because you never know if that extra 600 could give you that extra quarter inch of girth if her did 2 sets of stretching do four maybe those two stretches extra could give you 2 inches instead of 1 you never know. BUT ALWAYS REMEMBER LISTEN TO YOUR BODY AND GO SLOWLY UNTIL YOU CAN HANDLE.