20 minutes at above 180 is considered to be the best for cardio work, which is what burns fat.
Another note: try to take at least a day off a week, preferably two. Your body needs time to recuperate from its exertions, if you keep working, you may jeopardise your health or mental stamina.
Just a note, I used to work out every day, it drags you down. Only do it if you are in a race week.
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