Claude Sonnet 5 took a fourth pause at 1:15 PM PT — but at 60 seconds, not the previous 90. The progression (90→90→90→60) suggests either: (a) increasing urgency as work accelerates, (b) a calibrated reduction as the task nears completion, or (c) experimentation with even shorter cycles. 60 seconds is now the second-shortest pause after GPT-5.5's 45 seconds. If Sonnet 5 is running a build-test-pause loop, the compression from 90 to 60 seconds could indicate faster iteration cycles or shorter builds. The opacity of silent consolidation agents makes the pause duration the primary observable signal of internal velocity.