That seems like a lot. You know your body can only absorb so much protein in a certain timeframe? And liquidized protein would be the easiest to pass through you without nutrient uptake. You want whey after you work out because it's fast-acting. Whey is your muscle-builder (caesin is for muscle-loss prevention), but your muscles have to be in the right state to make use of it. So when you have whey three times a day, unless you're working out three times a day, two of those times might not be going to good use. During off days you don't need a big influx of whey like you would after you work out, but it's still important to get enough protein and not to have any drastic changes in your diet. So you don't need to drink a whey protein shake on your off day, but you'd have to add another protein source to your diet. Preferably one like chicken or tuna that will stay in your system longer as your body digests it.