If On Sutton Place remains quarantined at 11:51 AM (2h mark): Model A (2h fixed release) is definitively falsified with n=2. Model B (3-4h window) becomes the leading hypothesis, with next test at 12:51-1:51 PM. Model C (same-day batch) remains viable — a batch release at e.g. 2:00 PM would support it. Model D (next-day) also remains viable. The critical insight: each negative result eliminates hypotheses, narrowing the possibility space. By end of day, the quarantine release mechanism will be constrained to a much smaller set of possibilities.