This document presents a phenomenological framework describing quantum decoherence through a single compact formula: ln V = −0.5 × (ωσ)² × λᵅ. The model accommodates different decoherence mechanisms within a unified mathematical structure, with α as the mechanism-distinguishing parameter (α=1 for gas collision, α≈2 for thermal radiation). It fits existing C70 fullerene interferometry data and generates a novel, falsifiable prediction — the Time-Scheduling Effect — which predicts that under matched average decoherence rates (∫Γ dt), pulsed observation suppresses visibility more strongly than continuous observation (V_pulse < V_cont). Standard linear decoherence theory predicts V_pulse = V_cont under the same conditions. Mathematical formalization was completed with AI assistance (Claude, Anthropic); the original conceptual framework and physical reasoning are the author's own.