thats a good move imo,ive always done 12 weeks or 16 max, this way u really wont run the risk of shutting down to much when u come off n aint gonna have to take to many post cycle drugs. im not critizing anyone who stays on much longer though cause some guys can get away with super long cycles n make great gains with little side effects, i just play it safe n been doing it that way since 1983 when i did my first cycle