The time required for a sewer gas odor to dissipate depends entirely on its underlying cause. If the smell was caused by a dry P-trap or minor surface biofilm, it will vanish within 15 to 30 minutes after pouring water and an enzymatic cleaner down the drain and thoroughly ventilating the room. However, if the odor stems from a cracked pipe, broken toilet wax ring, or main sewer line break, the smell will persist indefinitely until a professional plumber completes the physical repair. Verification: Ventilate the space and check if the odor returns after closing windows.
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