If you want to be spot on with the brining, use weight as measurement, to make sure you're not oversalting.
Generally, for white meats, you want the salt ratio to be 1.5%-1.75% of (water+meat weight). By measuring salt using weight, it won't matter if you use table salt or kosher salt. Something large like whole turkey usually takes at the very least 24 hours, and 72 hours max. Another advantage of measuring by weight is, you won't ever get the meat too salty, overbrining will just affect the meat texture, not saltiness.
Also, keep in mind the concept or carryover heat, as this is key for doing any whole bone-in roast foods. The temperature of the meat will continue to rise even when it's out of the oven. So if you take out your turkey out of the oven at 165F, the temp will continue to rise approx. 5-10~F for a while, and your turkey breast might be overcooked by the time you carve it an hour later. For turkey I prefer cooking it low and slow to get even distribution of heat/cooking, and when it's fully cooked, give the turkey quick brush of oil and crank the heat up to get color on the skin.
A trick that I used for turkey, is the same technique that I do with whole roast chicken or duck, brine for 24hr, then drain pat dry, and let it sit uncovered in the fridge for another 24 hour to dry out the skin. Makes for crispy as fuck, peking duck style skin, and because of the brine, still juicy inside.
Also for people that are thinking of stuffing. The thing about stuffing is, when done right, it's really delicious because it soaks the turkey juices inside, but if you don't cook the stuffing to proper temp, you'll risk food-born illness. Personally I just cook them separately, and I mix in whatever pan juices I can get
Also, best advice I could give you, invest in a kitchen thermometer, walmart has $8-15 digital kitchen thermometers, they works.
something like this:
http://www.amazon.com/Taylor-Digital...en+thermometer
I do a lot of meats smoking, so this kind of thermometer is amazing since I can just leave the probe in the meat, and when it reaches the internal temp I want, the alarm will go off.