If I were you, I'd save the money until you can get enough to run more. How much you need will depend on your goals. At the very least, 2IU will help with some fat loss.  Of course, the more you take, the better the effect will be. 4IU would give better fat loss, IME. At around 5-6 iu ED, you'll see some muscle gain over the long term when combined with AAS. I would run it for at least 4 months no matter what your goals are. Less than that wont be enough time. Longer will only be to your benefit