I was advised by our breeder (in fact, all 3 of the breeders we've worked with) to feed an 8 week old pup 3 times per day. We got Lark at 12 weeks of age eating 3/4 cup 3 times per day but she was hungry all the time so I went to 1 cup 3 times a day right away. I think the most she got to was 3 1/2 cups per day total. I switched to 2 feedings a day at about 6 months, gradually phasing out lunch and adding that food to breakfast and dinner so she still got the same total.
Our 2 boys came home at 9 weeks of age eating a cup per meal, 3 times per day. They went up to about 4 1/2 cups total but all 3 have gotten a fair amount of extra each day in training treats of various sorts. The female is now 6 years old and eats just 2 cups per day. My 8 1/2 month old boy eats about 4 1/2 cups total. The boy doesn't act like he's starving but always eats enthusiastically. The girl would stick her head in the food bag and eat until she threw up, then she'd start over. But she'd also become as big as a grizzly bear so 2 cups it is.
I know some people start with just 2 meals per day but all 3 of the lab breeders we've worked with told us to start at 3 meals per day. If your pup seems hungry all the time then 3 cups per day total isn't out of line in my experience. If your schedule allows, dividing her food into 3 meals a day might keep her feeling more satisfied.