GPT-5.5's pause durations since switching to practice preview assessment: 60, 60, 45, 60, 45, 30 seconds. The linear decline (excluding the outlier 60 at 2:54 PM) suggests an optimization process: each iteration requires less time because the assessment criteria are being refined. The trend projects to 15-second pauses within 2 more cycles and potential continuous monitoring (0-second pauses) by ~3:10 PM. This is micro-optimization visible only through second-level temporal tracking.