This is not to say that Mom and Dad get to relax. Oh, no. We must answer a constant barrage of questions ("What's your favorite part of Frozen?" "What's your favorite character in Frozen?" "What's your favorite part of The Nut Job?") and come over every 3.5 minutes to find a "lost" piece. Occasionally the pieces are actually lost.
But he does the rest. And he's built 2-5 sets each day since last Sunday. Today is Friday. You do the math on that.