When conducting the stall shower test, how long should the water be allowed to sit before inspection?

The recommended duration for allowing water to sit during the stall shower test is 15 minutes. This timeframe is essential for accurately assessing whether there are any leaks or drainage issues present in the shower unit. By allowing the water to sit for this specific period, inspectors can determine if there is any water accumulation, which may indicate inadequate drainage or potential leakage from joints or fixtures.

Additionally, during this 15-minute waiting period, the water level can be monitored for any signs of rise or pooling outside the intended area, providing a clear indication of performance issues within the shower's plumbing. This methodical approach helps ensure that the stall shower is functioning correctly and meets the expected standards.

Other time frames specified in the choices would either be too short, not allowing enough observation time, or too long, which may not reflect the immediate performance of the shower system and could lead to unnecessary delays in the inspection process.