Dude there is a lot of conflicting info everywhere. I saw a post by someone that has years of experience saying 8 weeks is optimal because after that it's kind of just a waste. Then there those that swear by 12 week cycles. I'd say go with what works for you bro. Im about to start by 1st cycle in a few weeks and I have 2 10ml 250mg/ml vials of test e so that gives me enough for 10 weeks. I honestly think you should read as much as you can about everything and then start testing it out. Best of luck to you man...