Everything said here is true. You'll basically know when you're doing too much cardio because you'll be a little tired and a little fatigued but as you rest and your body gets conditioned, these symptons will subside.
When you get really serious, and to answer the question above about doing cardio twice a day, this really helps to burn calories. Doing cardio in the morning really stokes the internal fire to help burn calories throughtout the day. Doing cardio a second time later on in the day will bring your work rate back up and burn the calories that you consumed during the day. If you're doing cardio everyday try not to omit carbs too much during the day. This will give your body fuel it will need and keep it from touching any protein or muscle reserves.
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