Half hour is fine. At medium pace 350 sounds about right, too. The key here is consistency. Are you ready to do your cardio 4 times a week, 50 weeks a year (example: 2 weeks vacation), day in day out not missing a workout?
Cardio is a necessary evil when working out, most people hate it but what are you gonna do. Don't worry about how many calories you burn each session, worry about doing it every time you planned on doing it. It's hard enough.
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