Its doable but like whiteboy said you'll really be badly shut down and w/o HCG you'll prolly feel absolutely miserable those last 4 weeks w/o 4ad (I know shutdown is shutdown, 0 test is 0 test, but the duration of shutdown is relative to the length of time needed to bounce back during PCT).
If you have HCG, I guess you could get away with it. But I'm tellin you those last 4 weeks and PCT will be miserable.