In Jain Dharma, an Atthai is usually a 8-day fast.

So, in one year:

• 1 Atthai = 8 days
• 2 Atthai = 16 days
• 3 Atthai = 24 days

There is no fixed rule that says how many Atthai must be done in a year. It depends on the vow, strength, health, and guidance of the Sadhu/Sadhvi or Guru.

If you mean how many Atthai can be done in a year, the answer is: it depends on the person and their spiritual discipline.