Temporal Architecture as a Fundamental Constraint on the Quantum-Classical Boundary

I propose that temporal architecture places fundamental constraints on quantum-coherence propagation that go beyond standard environmental-decoherence accounts. Whenever two systems have strongly mismatched binding windows (τ), they cannot maintain relational coordination across their interface. Using adiabatic elimination on coupled fast–slow Hamiltonians, I derive a temporal decoherence rate of the form  Γtemporal ∝ (τslow / τfast)β, with β ≈ 1.2 (Ohmic bath).This framework dissolves Schrödinger’s-cat paradox: macroscopic superposition demands a temporal coordination that is impossible to sustain across the gulf between quantum (τ ≈ 10⁻¹⁵ s) and biological (τ ≈ 10⁻³ s) scales. It further predicts measurable coherence extensions in superconducting-nanowire detectors, with interference visibility scaling as  V ∝ (τdetector)0.7,and invites universal scaling tests across optical, electronic, and mechanical platforms. Empirical confirmation would elevate temporal incommensurability to a candidate fundamental pillar of quantum foundations, alongside environmental decoherence.