While this is a very good goal to strive for, if you limit yourself to only using this formula, you could be setting yourself up for failure. A recent study conducted at Stanford University took a group of people and divided them into two groups. Half exercised for 30 consecutive minutes, the other half exercised in 10 minute intervals - once in the morning, afternoon, and evening. At the end of the study, both groups increased their fitness levels at the same amount and at the same pace. If you only have 10 minutes, use it to your advantage.
Time is one of our most precious commodities.
Always have an extra pair of walking shoes in your car. Park ten minutes away from your office. Take the stairs. Instead of a coffee break take a walking break. Use at least ten minutes of your lunch time for walking.