Answer is : 5 Days 

Day 1: Dhanteras

Dhanteras, the first day of Diwali, marks the beginning of the festival. This day is dedicated to the worship of wealth and prosperity. People buy precious metals like gold and silver, as it is believed to bring good luck and fortune.

Day 2: Naraka Chaturdashi (Choti Diwali)

Naraka Chaturdashi, also known as Choti Diwali, is the second day of Diwali. It symbolizes the defeat of the demon Narakasura by Lord Krishna. On this day, people light oil lamps and burst firecrackers to celebrate the victory of light over darkness.

Day 3: Lakshmi Puja (Main Diwali)

The third day is the most important and is considered the main Diwali celebration. It is dedicated to the worship of Goddess Lakshmi, the goddess of wealth and prosperity. Homes are decorated with rangolis, and families gather for prayers and feasts, followed by lighting lamps and bursting fireworks.

Day 4: Govardhan Puja

On the fourth day, Govardhan Puja is celebrated, marking the victory of Lord Krishna over Indra, the god of rain and storms. This day emphasizes the importance of nature and protecting the environment.

Day 5: Bhai Dooj

The final day of Diwali is Bhai Dooj, dedicated to the bond between brothers and sisters. Sisters pray for their brothers’ well-being and prosperity, and in return, brothers give gifts and promise to protect them.