Time period in indian astrology

Every human being born in this world lives for a certain amount time and indian astrology divides the time period in to  nine dasas.The time period of a human life consisting all dasa periods is 120 years. 

•  Sun dasa - 6 years
•  Moon dasa - 10 years
•  Mars dasa - 7 years
•  Ragu dasa - 18 years
•  Jupiter dasa - 16 years
• Saturn dasa - 19 years
•  Mercury dasa - 17 years
•  Ketu dasa - 7 years
•  Venus dasa - 20 years