There is a selected technique in Vedic astrology to find out the Mahadasha period. In keeping with it, 3 Nakshatras are proportioned out to every World, that makes the number of Nakshatras rely to 27 for all the 9 planets. So, the Mahadasha of any World relies on the situation https://www.youtube.com/shorts/oUsNAkX7h9w