Growth trajectories M_BH(t) for PBHs with initial masses M₀ = 10⁻¹⁷–10⁻¹⁰ M_⊙ embedded in the solar core (color scale, from light to dark green). Trajectories are trimmed at 0.01 M_⊙. PBHs with M₀ ≳ 10⁻¹⁶ M_⊙ reach this threshold within a Hubble time; lighter PBHs stall in the hot Bondi regime. Horizontal colored bands indicate the accretion regimes from Section 3.1. Vertical lines mark the solar age (t_⊙ = 4.6 Gyr) and the Hubble time (t_H = 13.7 Gyr).