It depends on the person. If you are a pro that want to use it, you'd probably have to use high doses, somewhere around 80-100mg/ED. If you are just someone looking to harden up, gain a little strength, and look good, you'd probably just use 40-60mg/ED.
I wouldn't go over 6-8 weeks. I know alot of people say it's the safest steroid out there, but it's still 17-aa...So better safe than sorry. I'm just saying that's what i would do, so don't flame me on that one.