I cook at 275-ish - and I will say, it is miserly. If I do butts - 10 hrs-ish, I don't empty the woodbin in the front (not large at all).
If I do something small, like ribs, chicken, etc - 4-5 hrs, I only use about 1/2-2/3 of the bin.
I have a guy I get some hickory off of - he makes sledgehammer handles and I get his rejects. I will use 2-3 sticks (square, sledge handle size) every 30-40 minutes or so.
this is with an 84D