Thats a lot of cardio, do you actually run for the entire 90 minutes 6-7 days a week?
The effect would be slightly different, you'd burn the same amount of calories, but if you cut it into 3 workouts rather than one, more of those are coming directly from energy you stored from food.
However, you don't need to run 90 minutes, one 35 minute run 6 days a week is more than enough (heck man I go 3 days, used to go 5-6 but I lost too much weight like that,) if you are keeping the intensity high enough.
Since you're trying to get into overall better shape, I'd also recommend picking up a weight
training program. Cardio alone wont really do the job.