Answer

In Deravasi (Śvetāmbara Mūrtipūjak) Devasi Pratikraman, Namutthunam is traditionally recited 2 times.

Explanation

Namutthunam is a devotional praise of the Arihant Bhagwants. In Devasi Pratikraman, it is recited at specific points as part of the repentance and purification process.

Different local traditions or pathshalas may have small procedural variations, but in the commonly followed Deravasi Devasi Pratikraman order, it comes twice.

Takeaway

So, the short answer is: Namutthunam comes 2 times in Deravasi Devasi Pratikraman.