In Jainism, "upvas" (also spelled "upvaas") refers to a full-day fast, where one abstains from all forms of food and sometimes even water, depending on the level of austerity.

"Chauvihar" (also spelled "choviyaar" or "chauvihār") means abstaining from eating and drinking anything after sunset (specifically, after the fourth prahar of the day, which is approximately three hours before sunrise and three hours after sunset).

Comparison:

• 1 Upvas = Complete fast for 24 hours (no food, sometimes no water).
• 1 Choviyaar = Eating only during daylight and abstaining from food and water after sunset until the next sunrise.

Equivalence: 1 Choviyaar is not considered equivalent to 1 Upvas in Jainism. Upvas is a much stricter austerity and is counted as a full fast. Choviyaar is a daily practice or a partial restraint, not a full fast. In the Jain tradition, the merit (punya) earned from one Upvas is considered much greater than that from one Choviyaar.

Summary: 1 Choviyaar is not equal to 1 Upvas. Upvas is a stricter and more meritorious vrat compared to Choviyaar. Usually, there is no set numerical equivalence between them in Jain scriptures.