Convective timescale (color coded) as a function of the effective temperature and optical depth throughout part of the evolution of a 1.9 M_⊙ model (same as Fig. 2). In the center of the hydrogen convective zone, where we find the higher contribution from P_turb, the convective timescales are ≈ 10^-2 days, while at the edges of the hydrogen convective zone τ_conv increases up to ≈ 10¹−10² days.