Several exercise programs I've seen suggest lifting weights 3 times per week, but also say that progress can me made by only lifting twice per week (although it will be slower).
These sorts of programs also suggest eating large amounts of protein. I've heard various numbers, although 1 gram of protein per pound of body weight (or of lean bodyweight) is a common one.
But regardless of how much protein you require when following a 3-times-per-week lifting program, my question is this: if you're only training 2 times per week and aiming for gains at a slower pace, do you need less protein? I would think so but I want to be sure.