Budh (Mercury) mahadasha for Kumbha (Aquarius) 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 Mercury mahadasha lasts 17 years in full. Most people meet it partway through, so the part they live through can be shorter.

Mercury stands for thinking, speech, learning, trade and writing. Its period tends to favour study, skills, business and anything that runs on communication and quick judgement.

Counted from Aquarius as the first house, Mercury rules Gemini and Virgo, your 5th and 8th houses. During its period the matters of both come forward:

The 5th house is children, study, creativity and romance. Its lord's period tends to favour learning, creative work, matters of children and decisions taken with a clear mind.

The 8th house is sudden change, shared money, in-laws and hidden matters. Its lord's period tends to bring turns you did not plan, joint finances to sort out, and an interest in research and what lies beneath the surface.

Mercury is neither friend nor enemy to Saturn, the lord of Aquarius. Its period tends to give what you put into it; the planets' places in your own chart decide more than this relationship does.

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 Mercury mahadasha, where the planet sits in your own chart and the sub-periods inside it shape the years more than your Moon sign alone.