the 50 days is from old school articles many years ago, you can stay on it for months and still see results , as for 40mcg dosage, yes thats a nice dosage , and i wouldnt take it at night personally, I would stick to pre workout or post workout, personally i like 1 hour pre workout, followed by loads of carbs, then i hit the gym, i try to sip on a 50/50 carb/protein drink during workout, then after the gym, at home i cram as much protein as i can into myself, you will get way more uptake of whatever you put into your body due to it being insulin-like in that regard, so thats how i do it daddio, works great for me this way,
the reason you hear so many different opinions on the best time to take it is quite simple, its long r 3 meaning 24 hours, so regardless of when you take it, youll get the benefits, though it is most optimal to load up on your carbs and/or proteins directly after using it, it is also systemic, as in the whole body benefits from it, however when you do go to a muscle with it, more will tend to attach to that area, which is why many guys say its site specific,