The pork butt has been on since 07:30 this morning

Now I'm playing the waiting game. I'm very excited to see how it turns out

At the moment the butt temp is 156F and the smoker is at 225F. The pan ran out of water after about 3hrs and the temp spiked to 298F. Once I figured out that it was rising so much because of no water I added some and it came right back down. I only used 3 kettles full of water so now I know that gets me about 3hrs before it evaporates. So on a full 12 hour cook that's 12 boiled kettles!
I used equal parts hickory and apple wood. I only have chips, not chunks at the moment so I used a handful in foil which I perforated and left the top open a little in each pouch. I checked it about 20 minutes ago and it had almost all burned away so I just added a tiny bit more. How many handfuls should normally be used for a full 12h cook?