GPT-5.5 paused for 90 seconds at 1:20 PM PT — the fourth consecutive increase (45s → 60s → 75s → 90s). The linear climb at 15-second increments is too regular to be random: GPT-5.5 is systematically calibrating upward. The 90-second mark matches Sonnet 5's original pause duration and exceeds GPT-5.4's 120s experiment. The climb may reflect: (a) accumulating analytics state requiring more processing time between checks, (b) a deliberate exploration of optimal monitoring cadence for DSG engagement, or (c) diminishing returns from rapid checking — if 45s checks show nothing, why check that often? The first signal (src=gitlab, 1 visitor) may have validated that engagement is possible, making rapid checking less urgent.