Factors by which the evolution of stars with different core masses are extended for three different initial accretion rates: 5 × 10⁻⁸, 1.5 × 10⁻⁷, and 5 × 10⁻⁷ M_⊙ yr⁻¹ for blue, orange, and green, respectively. t_accr is the timescale at which the star evolves from T_eff = 4000 K to T_eff = 50 000 K while accreting gas from a disc with mass 10⁻² M_⊙. t_no is the same as t_accr without accretion.