I would be inclined not to listen to what the side of a protein container says about serving sizes...
of course they are goin to say "take 3 scoops" 3 times a day. They are trying to sell the crap.
figure out how much protein u need a day, usually 1 gram for every pound of body weight (kg x2.2) then use the protein to fill in the gaps between meals, thats why its a "supplement"
Theres no use having a 100 grams of protein in one hit, it needs to spread out through the day