I have had butts go 12 to 16 hours. Sort of hit or miss. Yes, you can wrap and finish in the oven. You just don't want the meat to dry out. The cooler use is the resting period before pulling, or to keep it piping hot for use a couple of hours later. During the rest, the meat temp rises somewhat and get more tender. I think in your time zone, no matter which way you go, you are going to be up for awhile. As most folks will tell you, each smoke can be a little different.
When I need to double check a temperature, this is what I use:
http://www.thermoworks.com/products/thermapen/
Pricey but accurate.