I fed my puppy Fromm large breed puppy gold because that us what my breeder feeds their pups and was recommended. It is a fairly good quality food (with the correct percentages of calcium and phosphorus required for a large breed dog - goal is SLOW growing, not fast, to hopefully prevent joint problems in future) and a reasonable price (relatively speaking). I really don't recall how much I was feeding him at 10 weeks, but it was three times a day, for sure. A 30 pound bag at around $52 would certainly last much more than a month at that age. He was eating 6 cups per day at a year when I transitioned him to adult food (mine is extremely active). Hope this helps!
Oh! And search for "good quality puppy food" or "what to feed my puppy" threads for much and constant discussion on the best food for a healthy dog long-term!