Answer

If you mean Chovihar, it is the time from sunset until sunrise during which Jains do not take any food or water. ( jainworld.jainworld.com)

Explanation

In simple terms, Chovihar is an evening vow of discipline. It is observed after sunset and continues until the next sunrise. Some Jain traditions also describe it as avoiding food and drink after dusk. ( jainworld.jainworld.com)

Spiritual Understanding

Chovihar is practiced to support ahimsa and self-control. Since night makes it harder to see tiny living beings, Jains avoid eating or drinking after sunset to reduce harm and maintain purity in conduct. ( jainworld.jainworld.com)

Takeaway

So, Chovihar time = from sunset to sunrise. If you want, I can also explain the difference between Navkarshi, Tivihar, and Chovihar.