Just got off the deca part of my current cycle. Ran it for 10 weeks at 300mg ew.
My advice, 400 to 600 mg ew and at least 12 ta 14 weeks. Run your test that your gonna stack with it (of course) two weeks longer.
Around week 6 (if you do get it at all) you will get deca dick. Avoid this by running caber or bromo with cycle or at the very least have some on hand.