A bar of soap can last for years if it was made using a proper formula.

When soap is not in use:

-keep it in a dark dry place, well ventilated

-avoid plastic wrapping, instead use breathable material, just leave in the original natural packaging we use

-avoid moisture on your soap

As soon as you start using your soap in a bathroom, you have to know a few simple rules:

-it is best to have at least 2 bars of rotating soaps, then one of them can dry

-soap needs a quality soap tray

-do not leave your soap in water or under running water/shower