Fraction of isolated hot Neptunes (10 < M_p/M_⊕ < 30; blue) and hot Jupiters (M_p > 100 M_⊕; red) with eccentricities exceeding a threshold e_crit as a function of inferred circularization radius, a_f = a(1 − e²). The two panels correspond to e_crit = 0.1 and 0.2. Points show fixed-width 0.02 au bins, and labels give the number of eccentric planets relative to the total number of systems in each bin. Systems are required to have reported eccentricity uncertainties σ_e < 0.1, and hosts with known planetary companions inside 0.5 au are excluded. Hot Jupiters show a pronounced decline in eccentric fraction toward smaller a_f, while hot Neptunes show little evidence for a comparable trend. Although the current hot-Neptune sample remains small, this behavior is qualitatively consistent with the weak dependence of circularization time on final orbital distance predicted by thermally regulated tidal evolution.