The length of time a stone sealer will last depends on the type of sealer used, the porosity of the stone, and how often it is exposed to water or other liquids. If a penetrating sealer is used, it should last for several years. If a surface sealer is used, it may only last for a year or two before it needs to be reapplied.

It depends on the sealer. Some sealers might only last for a year or two, while others might last for several years. It's important to reseal the stone tile regularly in order to keep it looking its best and to protect it from water and staining.