While there are health and fitness advantages to keeping your heart rate elevated for longer, you will burn the same calories in 3 x 10 minutes as you will in 1 x 30 minutes.
Don't worry too much about 60 minute workouts. Once you get to being able to work out for 30 minutes or so, you are better off adding more intensity to your workout, rather than more time.
In fact, there is some evidence that very long duration workouts (40 minutes plus), tend to be muscle wasting, and detrimental to your longer term fat loss efforts.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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