In Jainism, recitation units like "logas" (short for "Logassa Sutra") and the "Navkar Mantra" are both important prayers, but they are distinct. There is no direct conversion or equivalence between reciting the Logassa Sutra a certain number of times and reciting the Navkar Mantra a certain number of times according to Jain scriptures or practice.

Logassa Sutra is a separate prayer dedicated to the 24 Tirthankaras, while the Navkar Mantra is the fundamental prayer that pays respect to the five supreme beings.

If you are seeking a specific equivalence (e.g., "40 Logas equals how many Navkar Mantras?") for the purpose of penance (tapasya), rituals, or prayers, such conversions are sometimes set by local tradition, teachers (gurus), or sect practices, but there is no scriptural basis for a standard conversion.

If you are doing this for a specific religious vow or ritual, it is best to consult your local Jain monk (sadhu/sadhvi), guru, or temple authority for guidance, as practices may vary by sect (Shwetambar, Digambar, etc.) and tradition.