I would say start off with 3 a day for the first week due to the possible stomach irritation, but they changed the formula so I'm pretty sure the stomach problem has dispersed.
So either start off low, or go right up to between 4-6 per day. I would recommend staying on for at least 6 weeks, but that's just my opinion. For me, I really started to notice the effects between weeks 3 & 4, so being on for at least another 2 weeks was great.
As long as you train hard, eat plenty, and get a lot of rest at night, you should get great results. Plan to see nice increases in strength, as well as increased muscle hardness, vascularity, and lean muscle. Good luck