Yes but it's a touch difficult to keep living expenses below $0, which most people in the developed - let alone developing - world would need to do on their salaries to save the extra $80k/year.
ha, yes. looking back, I don't know how we did it as fast as we did. we kept our expenses low (20-25k/year low) and poured every dollar into the debt. We didn't live in a fancy house or have new cars (beyond when we got in to it with the new car loans).