If you're replacing a tub with a tile-in shower, you'll require added days for niche installs, shower doors

https://smart-wiki.win/index.php/Phoenix_Home_Remodeling%E2%80%99s_Budget_Alignment_System_for_Bathroom_Remodeling_in_Gilbert

If you're replacing a bath tub with a tile-in shower, you'll need extra days for specific niche installs, shower doors, and precise water drain planning.