How to increase the longevity percentage?

[Blaze_leaf]

Hi! Somebody knows what is the longevity percentage? And h

 

[Yooper]

Longevity describes an estimate of how long a bar will last in the shower/bath.
It is just a guideline for how long you soap will last. The higher the number, the longer lasting the soap. The number comes from subtracting the Cleansing value from the Hardness Value. It is based on the solubility of the soap. To increase the longevity, add more ‘hard’ oils that are solid at room temperature, like tallow, palm oil, shea butter, coconut oil, etc.

 

[Blaze_leaf]

Thank you very much for your answer