[Ramma]

It depends on how much YOU put into it.. how serious you are about it..

Are you going to eat right, take care of your body (stretching, not drinking, etc).. how many days are you going to train.. all of that plays its part in how fast you will increase your abilities..

Amateur MMA.. 1 year of serious MMA training (you already took step 1 with BJJ, now you really need a striking and grappling (as in takedowns, throws, wrestling, etc) martial art such as Judo, Greco Roman, Sambo, etc) is all you would need.

Take it serious, buy a notebook, write stuff down, do crazy shit like throwing knees while going up steps (I have to go up 8 flights of stairs to get to one of my classes at college, the stairwell is empty, and I throw knees on every step, just to work on speed and such).

Maybe you can do it quicker, but you have to want it.