The time it takes for a window cleaner to complete a job depends on various factors such as the size and number of windows, the level of dirt and grime present, and any additional tasks involved, such as removing stubborn stains or debris. Typically, for a standard residential property with an average number of windows, a professional window cleaner may take anywhere from 1 to 3 hours to ensure a thorough and meticulous cleaning process. However, larger or more complex properties may require additional time for comprehensive cleaning. For accurate estimates, it’s best to consult with a window cleaning service based on the specific requirements of the property in question.