you could run it the whole time takes 2 weeks before i notice increased recovery time, its great for the joints though, be sure to stop it 3-4 weeks before you plan to start PCT though, it has a very long half life. i think most people under estimate the half life of deca and sust and so they go into PCT with some of it still in their system which makes PCT much harder or impossible. best imo to just run an oral for the last 3-4 weeks and take no shots to let your body clear.