I wrap on time mainly to limit smoke; and that's usually at the 4.5 hour mark. Your time (even if you wanted the exact same results) will vary because each smoker and wood will produce different results. In the old days I'd spritz heavily, but since stopping that I haven't noticed much of a difference...
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from everywhere)