Hot water manual operations by immersion time?

• A. 15 seconds
• B. 30 seconds
• C. 45 seconds
• D. 60 seconds

Answer: (B)

Hot water sanitizing relies on immersing cleaned items in hot water long enough for the heat to kill remaining microorganisms. For manual hot water sanitation, the standard duration is a 30-second immersion, provided the water is hot enough (typically around 180°F/82°C). This 30-second contact time ensures sufficient heat exposure to achieve sanitization. Shorter times, like 15 seconds, may not reliably sanitize, while longer times aren’t required and can slow operations without adding benefit. So 30 seconds is the correct minimum immersion time for hot water manual sanitizing.