The discrepancy between the locally inferred Hubble constant and the value reconstructed from the cosmic microwave background within ΛCDM remains one of the main tensions in late-time cosmology. This work explores the hypothesis that the effective time experienced by cosmic clocks differs from the coordinate time of the FLRW metric. A minimal phenomenological implementation, inspired by the broader MBD framework, is parameterized through a redshift-dependent emergent-time factor N(z), such that dt_eff = N(z) dt and H_eff(z) = H_t(z)/N(z). Several families for N(z) are explored numerically; a refined scan in the sigmoid family yields 185 simultaneously validated models and identifies a stable compatible region around N0 ≈ 0.916–0.920, z_c ≈ 0.045–0.070, w ≈ 0.010–0.030. The main prediction is an effective present‑day deceleration parameter q_eff,0 ≈ –0.75 ± 0.14, significantly more negative than the standard ΛCDM value (–0.55), yet physically plausible and falsifiable. This framework offers an alternative interpretation of the Hubble tension without introducing exotic matter components.