Agree, staying in shape directly corresponds to my sanity, well-being etc. I'd cut out alot of other stuff from my day before I'd ever consider cutting the workouts (though that hasn't been true the last six months for the first time in years, I've turned into such a bum). Ideally, I'd do my cardio first thing in the AM on an empty stomach basically everday, and then my lifting four evenings a week. Not sure whether I'll ever have the time to get in two workouts as a 1L, but I will try--tough to really say without knowing my exact schedule, but I'm envisioning lifting basically right after my last class of the day, and getting the cardio in either in the AM or in the evening (particularly if I have a late night in front of me).
Biggest advice for folks who aren't used to, or aren't generally successful, keep up regular workouts while ultra-busy elsewhere:
-Don't have some overly rigid program tied to days of the week--i.e. don't schedule your only cardio for Monday, and then if Monday gets busy and you miss the day, you've missed the whole week. The best programs are based on number of days (i.e. Day 1--cardio; day 2--chest/triceps; day 3--cardio; day 4--back/biceps; day 5--cardio, day 6--legs and then repeat). This way if you miss a day, you just pick up the cycle where you left it off.
-Something is always better than nothing--so even if you have an hour long work out planned, and you find on a given day that you only have time for half of it, do it anyway (this is so key with diets too--i.e. if you slip up and eat garbage, doesn't mean you've got to eat it all day).
-When really pressed for time, get creative--you can easily get a great workout in at home just jumping rope, jumping jacks, stuff like that.