Six week old pups would be less but as they leave at 8 weeks most are eating about 3/4 cup to a cup three times a day. Maybe someone with 6 week old could answer. Depends upon size of pups also.
Typical feedings for 6 week old pups here is 1 to 1 1/3 TOTAL cups per day divided over 4 feedings.
Amounts are slowly increased between 6-8 weeks old so that pups are eating 1.5 - 2 TOTAL cups at 8 weeks old divided into 3 feedings.
I know there are breeders feeding/recommending a lot more but that is what works for us. Feeding any more results in poor stool! My pups are not small either.
We free feed our puppies up to 8 weeks old. They have great poop consistancy. At 8 weeks they move to 1 c 3x a day feeding and then go up from there as they grow.
I am feeding the same as Wade, about 1.5 to 2 cups per day per puppy. I feed this amount over three feedings so about 1/2 cup per puppy at each feeding. Feeding more just gives me loose stools and overweight pups. Perhaps I would feed more with a different food but with what I have used (GO! Natural, Innova, Kirkland) it has always been this amount.