Working at maximal intensity for an extended amount of time is physiologically impossible. So if you think that performing tougher workout routines for longer durations will make you shed fat faster, you may want to change your weight loss strategy.
In fact, there is a much more effective way to experience body transformation in much lesser time. Instead of spending hours grinding it out with traditional workout regimes, there is a better and faster way to reap the full fitness benefits by utilizing high intensity movements in short bursts.