Shani (Saturn) mahadasha for Simha (Leo) Moon sign

In the Vimshottari system a life moves through nine long periods, each ruled by one planet. The planet that rules the period sets the tone of those years: the areas of life that come forward, and the kind of effort that pays.

The Saturn mahadasha lasts 19 years in full. Most people meet it partway through, so the part they live through can be shorter.

Saturn stands for time, duty, patience, hard work and structure. Its period tends to ask for steady effort and responsibility and repays it slowly but lastingly; shortcuts tend not to hold.

Counted from Leo as the first house, Saturn rules Capricorn and Aquarius, your 6th and 7th houses. During its period the matters of both come forward:

The 6th house is daily work, service, competition and debts. Its lord's period tends to bring hard work and rivals to deal with, and favours steady routines and paying down what you owe.

The 7th house is partners, marriage and dealings with other people. Its lord's period tends to bring partnerships forward, in marriage and in business, and to teach through other people.

Saturn counts Sun, the lord of Leo, as a natural enemy. Its themes may meet some friction with your temperament, so patience and a steady routine help the period give its best.

Which mahadasha you are in, and when it began, depends on the Moon's nakshatra at the moment you were born, so it is personal to you. Even within the Saturn mahadasha, where the planet sits in your own chart and the sub-periods inside it shape the years more than your Moon sign alone.