How Long Does It Take To Replace A Bath . Upgrading your bathtub can drastically improve your bathroom’s appearance and your family. The average time that it will take for a new shower tray to be installed is around 8 hours, which includes a couple of hours to replace the shower unit and around 1 hour for the switch as well as tiling. How Long Does It Take To Replace A Bathtub? - Nj Bathroom Remodeling & Bathroom Renovation from bathplanetnewjersey.com But before you start scrubbing, take a look at your bath sponge, and ask yourself how long it's been since you replaced it. “cleaning sponges should be replaced when they start to smell or break down and fall apart. When you are sure the bath is level, drill pilot holes and screw the feet to the floor.