I just recently finished dnp early. Intended on 2 weeks and made it 11 days.
2 weeks is max for dnp and anybody that does it longer is uneducated on it. You're body becomes use to it and stops it's fat loss effect, but continues poisoning you.
Some do it 10 days on, 10 days off, then 10 days on again. After running it, that would be my preferred method.
You will feel like hammered shit after about 4-5 days. Especially with that junk you're talking about using. If you can't find good crystalline dnp then pass on it. The powder is industrial grade chemical and crystal is made specifically for this purpose in a lab.
Start at 200-250 for 3 days to see if you're allergic, as in a red rash all over. Benadryl will help this. Then if you're a big individual, say over 200lbs you can go to the mild dose of 500 daily. 750 is considered high dosage and isn't advised by anyone.
Be aware of your electrolyte depletion, so drink gatorade and enough water even though you won't want to.
I'll say dnp isn't worth it. I tried it just to see how much weight you would lose if you didn't change your diet at all. 5lbs in 11 days. It works, but diet and cardio is the right way, dnp is the bitch way to lose weight.