I bought GNC Re-Built Mass, super-anabolic mass gainer (white and yellow can)

It says mix three level scoops (243 grams) with 16fl.oz of cold water or milk. Consume one serving daily. For best results, mix in a blender

that's a lot of S H i T to drink! lol can i like drink one ("cup") after and before work out and maybe the last one before going to bed. or should I drink it all at one time?

what do you recommend me?