What is the cooking time for a stuffed turkey at 350 degrees? I read that it should be 20 minutes per pound, is this correct?
Turkey is done when the internal temperature reaches 160° F. That's the temperature required to kill the bad stuff; so any cooking for any longer just dries out your turkey unnecessarily.
However, getting to this temperature varies depending on a lot of factors like your oven, the turkey's construction, and the exact phase of the moon. (Just kidding about the moon - kinda.)
The generally accepted formula for estimating cook time at a standard 350° F bake is 20 minutes per pound of turkey + another 20 minutes. Thus, an 11 pound turkey would reach 160° F in about 4 hours. (Note that this is for a truly fully defrosted turkey.)
If you're doing a traditional "shoved into the raw turkey cavity" thing, add another 20 - 30 minutes to get the stuffing up to the 160° F. temperature. Since the stuffing is put into the raw cavity, it's likely to absorb raw turkey juices, which must be brought up to the same safe temperature.