The "Cento Ore" is divided into two sections: Speed or Regularity.

In the Speed section, the final classification is calculated by adding up the times obtained in the track races and special stages, to which any penalties are added; the Compensated Classification is then corrected with a coefficient based on the age and characteristics of the car.

The Regularity section shares the same route as the Speed section, and offers laps on the track and tests on roads closed to traffic.
In track events, each crew has to complete the first lap in the time of their choice and must repeat the same time in subsequent laps. The tests on closed roads are "average tests", with the possibility of choosing between high or low average. In both cases, early or late completion of the time will result in penalty points which will affect the final classification.