This reports the single largest delay value, in microseconds, observed during a completed delay-measurement test run, the measured counterpart to the configured maximum-delay threshold. An admin looks at how far this maximum sits above the average delay to gauge volatility: a maximum close to the average indicates stable performance, while a maximum far above the average points to occasional severe spikes worth investigating even if they're rare. For example, an average delay of 200 microseconds but a maximum of 8000 microseconds would signal a rare but severe congestion event that a purely average-based view would completely hide.