Too long, especially for the temps you were at. Spares are 321, BBs are 221 at a fairly consistent 225. IF temp goes higher, then you might go with 211 or some variation of it.
321, 221, and 211 (and their variations) are meant as guidelines. Its best to learn to cook by feel instead of by time. At any given temp, when the ribs start to pull back a bit and have a nice color, wrap them in the foil and put them back on. When the ribs are close to having the consistency/texture that you want, remove them from the foil and put them back on the smoker to firm up. If you wish, this is when you would glaze them.