Depends on outside temps. It has been 50 to 55 degrees lately.
I would say 4 to 6 hours if they are not too thick.
Leave them alone for the first 4 hours, only adding wood. 2 to 3 pans should do the trick. Check the fish after 4 1\2 or so. Remember the fridge can be used to dry them out a little, just leave the fish open for a few days if it is a little soft. But over done will allways be boot leather. good luck.
Nut