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A standard shower pan replacement with a prefabricated unit takes about four hours for professional installation. The timeline includes removing the old pan, preparing the subfloor, and installing the new unit. 

Custom installations may require additional time for proper waterproofing and material preparation. Factors that can extend the timeline include discovering water damage during demolition, complex drain configurations, or custom tile work that requires multiple days for proper curing between steps.

Warning signs that indicate the need for shower pan replacement include visible cracks in the pan surface, water pooling around the drain area, and soft spots in the flooring near your shower. Water stains appearing on the ceiling below your bathroom often signal a compromised shower pan. Persistent mold or mildew that returns despite regular cleaning suggests water penetration beyond the pan's surface. Movement or flexing when standing in the shower indicates structural issues beneath the pan requiring immediate attention.

Changing your shower pan dimensions is possible but requires careful planning. Installing a larger pan might necessitate modifying walls, moving plumbing, or adjusting surrounding fixtures. Downsizing to a smaller pan leaves gaps that need addressing with additional tiling or structural modifications. 

Either scenario may require building permits if structural changes are involved. Working with experienced professionals ensures proper waterproofing, adequate drainage slope, and compliance with building codes when altering your shower's footprint.