Our Cookie was with us for about 10 years. She kept her decent temperament, only getting cranky when my brother and I would raid her nest to socialize her kits. The kits grew up and left the area (we lived in a park system called the Emerald Necklace) but Cookie stayed, went with us for three moves. I guess it depends on the individual animal and the way its kept. Cookie was "free" for most of her life, only penned when we moved to an area where she would have been killed on the roadway.
Slinky