exactly. deca is a very long ester and can linger, so if you were using test e or test c you would want to leave the test a couple weeks longer so the test doesn't clear while the deca is still active. for the sake of discussion, if the cycle was drastically mismatched and you were using deca and test prop, I would stop the deca 4 to 5 weeks before stopping the prop. ideally I like to match esters closely for proper start/stop times.