During the week, she gets two 30-45 minute walks. We also go to the dog park as often as possible. In the summer, it's usually 90 minutes 4-5 times a week. In the winter (when it's dark so darn early), it's usually only 2-3 times a week (and only until my fingers are about to fall off from cold--usually only 45 minutes!)
We also do agility lessons for an hour each week, and try to get in some training practice daily (failed, lately...)
Finally, she goes to day care and runs around all day once a week.