A drying window of twelve hours is generally insufficient for cement-based tile grout to fully cure and achieve its maximum structural strength, even though it may feel firm to the touch by the following morning. While standard tile grout typically sets up enough within twelve to twenty-four hours to allow for light foot traffic or initial cleaning of residual haze, the complete chemical hydration process—known as curing—takes anywhere from seven to twenty-eight days depending on ambient humidity, room temperature, and grout depth. Exposing fresh grout to heavy moisture, scrubbing, or intense physical stress before it has adequately cured can lead to premature crumbling, staining, or weakening of the joint lines.
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