As long as you're getting about 20-30 minutes of cardio, 3-5 days per week, you are fine to divide that up however you'd like. You get the most benefit from doing at least 10 minutes at a time if you need to do shorter workouts throughout the day.
Hope that helps,
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford