Narayan Bali Puja is generally performed during Pitru Paksha (a 15-day period in the Hindu month of Ashwin, usually in September or October) or on Amavasya (a new moon day). It is also recommended to consult with an experienced priest to determine the most auspicious time based on specific circumstances and Nakshatras (lunar calendars).

A more detailed breakdown follows:

1. Pitru Paksha: This period is considered very auspicious for performing rituals honoring ancestors, making it an ideal time for Narayan Bali Puja.

2. Amavasya: A new moon day is another auspicious time, especially when it does not coincide with a solar or lunar eclipse.

3. Other auspicious days: Depending on the specific situation and individual Nakshatra (lunar calendar), other days such as Ekadashi (11th lunar day) and Dwadashi (12th lunar day) may also be considered. 4. Unfavorable Times: Generally, it is recommended to avoid performing Narayan Bali Puja on Ekadashi (unless it is Pitruda Ekadashi) and Amavasya during eclipses.
5. Consult a Pandit: An experienced priest can provide the most accurate and personalized guidance on the best time to perform the puja, based on each individual’s situation and the specific rituals involved.