I'm a university teacher too, and work two hours every morning. I was heartbroken having to return to work when ds was 4 months old, but it's been going OK this year so far despite my fears. I've found it's actually relaxing to sit in the quiet classroom before 9:30, when class starts, and just organize and think for a few minutes.
Getting out of the house is the tough part, as so many others have said! What a disaster area the house is.
Sadly, I never could pump enough to make it worth my while; dh just gives the baby formula if he's unable to extend him until I get home at 11:45. My milk supply seems fine otherwise, anyway.
By the way, I was in exactly your position for many years--part time, that is--until they needed someone full time, and I got the job. (Yes--here, two hours a day is full time!). I don't adore my job, but you can't beat the hours and the vacations!