Answer

In Navkarsi Pachchakkhan, traditionally one says the Navkar Mantra 3 times.

Explanation

Navkarsi is the vow taken in the morning to avoid eating or drinking until a specific time after sunrise. While taking this Pachchakkhan, the Navkar Mantra is generally recited three times with devotion and awareness.

Takeaway

The main spirit of Navkarsi is not only the count, but doing it with bhav, discipline, and respect for the Pachchakkhan.