the longer you veg the bigger the yeild in most cases. In my opinion though, you should cut your plant count down. ITs gonna get crowded in there, and plants need room to grow. I actually increased my yield by decreasing the number of plants i had. I had pretty much the same size tent and i yielded 6 more ounces by dropping my plant count from 6 to 4. iam not saying that this will happen for everyone, but i do know the plants grow bigger and better when they arent crowded.