I'm a grad student, working with an assistantship at my school.
We go to an intermediate puppy class for an hour a week, and will probably move to agility or something once this one is finished.
We walk every day, 30-90 minutes, play in the dog park or the park across the street.
We spend time doing some obedience and tricks in the house, and a good game of tug/fetch.
I try to hit the dog park 3-5 times a week, and he gets to go to an all day day-care about once a week. Day care is a life saver during finals.
At worst - he gets 30 mins of outside play time, and about 30 mins inside time. (More than a day or two of this and I have a wound-up crazy dog! Which is why I discovered daycare for finals weeks.)
At best - we spend a full day doing things.
Whitman ARCH, RL1X, RL1 (AOE), RL2 (AOE), CL1, CL2, CL3 3/01/2010 GSDx
George 3/01/2008 Orange Tabby DSH cat
Sofia 3/01/2008 Black DSH cat