When changepuppy amt to adult amt of food

[rrboxer]

Okay, I have Bishop (5 months) on Fromm Food (Beef Fritata) and the instructions says if puppy feed to feed "two to four times food may be required for puppies". When is he actually considered an adult? At 1 year? a 1 1/2? I know boxers mature slowly and I've read they don't mature till 2 maybe 3 yrs etc but for feeding isn't 1 yr considered adult and at that time switch to adult portions? I can't remember when we stopped giving Lacy puppy portions and gave her adult portions. I have a bad memory.