Never go off!
But if you must, go off for 4 months out of the whole year and stay on the rest.
Switch drugs every 3 weeks and use massive dosages. Get results then get out before the negative sides build up.
CHEMICAL MUSCLE ENHANCEMENT PART I AND PART II are great reads.
imo, if your going past two weeks you might as well make it an 8 weeker.
bill roberts has estimated that t sgutdown starts around week 3. if you go four weeks you will definitely be supressed and it may take more than 4 to recover.