Quick Fix Cardio Exercise

I am a very busy single working mom. Every day, my my many different roles demand 12 hours from me, mostly away from my own son and other much more important things like family, and myself. I've gotten used to the belief that exercise should at least reach 15 minutes in order for our body to maximize the full benefits. The past years have proven me wrong about that. HIT or High Interval Training has become very popular already, same principle with meta-fit exercises.