5 1/2 hours in to building the Hogwarts Castle I was able to (with Saun's help) get all 73 bags of legos sorted and part of the foundation built. I was also able to get the heads of households put together, just need to get the rest of their wands out. Welp that it for the evening. I feel now that the parts are all sorted (since the bags were not numbered or labeled for all 6440 pieces) my next sit down will go a little quicker.