The duration of grout sealing can vary depending on various factors such as the type of grout, the quality of the sealer used, and the level of wear and tear in the area where the grout is installed. Generally, grout sealing can last anywhere from 1 to 5 years, although some high-quality sealers may last longer.
It's important to note that sealing is not a permanent solution, and over time, the sealant will wear off due to foot traffic, cleaning, and exposure to the elements. To maintain the effectiveness of the grout sealer, it's recommended to reapply it periodically. As a general rule, it's a good idea to inspect your grout every year and reseal it as necessary. This will help to prevent dirt, stains, and other contaminants from penetrating the grout and causing discoloration and damage.