Well... normally I'd kind of say "dude, the information is like, right there. Read it." But you sound sincere in your indecision and confusion, so here's a little advice: do 5 days on, 2 days off (like don't dose on the weekends or something). That's not ideal, but it's what they might recommend if you were getting it from a psychiatrist.Tolerance will build no matter how you take it. Dosing orally can last a long time. If you take a seriously massive fucking dose, like a gram, you will be tweaked for 24 hours. A gram is 1000mg, FYI. A dose of 30-50mg might have you coming down 6-10 hours later... something like that. Frankly I haven't taken that little for so long I don't even remember, but I think that's about right... so dosing twice in one day would either overlap and spike your blood levels in the middle of the day there, or you'd have insomnia. So I'd suggest dosing once in the morning orally, and sticking to the same dose. Don't up it. Find what works for you and stick with it.The dosages the OP recommends are too high for daily use. You will cause some damage doing that, in my opinion. However, I am not a medical professional. Just a guy who fucking loves (meth)amphetamine and loves science, so take my advice in context of the source (a meth enthusiast who reads lots of science stuff for pleasure).The Physician's Desk Reference recommends 40mg of dextroamphetamine (weaker than meth, in a nutshell) as the daily maximum. They usually ignore that. You can get prescribed 100mg a day or more if you get a liberal doctor who isn't afraid of backlash from irresponsible prescription practices. But don't do over 100mg a day. Just don't do it. Even at 100mg a day, you're going to develop some level of physical dependence (as in withdrawal will start if you don't take it for 24-36 hours). You also risk heavy psychological dependence at that dose.So again, I'd say 30-50mg once a day orally. Just my .02 BTC. Buy a milligram scale off ebay or amazon or something. They're like seriously 20-30 bucks. You won't know how you lived without it, I promise.