Answer

In the Deravasi Śvetāmbara Rai Pratikraman, Namotthuṇam / Namutthuṇam is generally recited 3 times.

Explanation

In Rai Pratikraman, Namotthuṇam is recited as a reverential salutation to Arihant Bhagwan. The exact placement and count can vary slightly depending on local tradition, pathshala paddhati, or sangh practice, but in the commonly followed Deravasi tradition it comes three times.

Takeaway

For your own daily practice, it is best to follow the paddhati taught by your guru, upāśraya, or local sangh, because minor sequence differences can exist within accepted Jain tradition.