Ratios between lifetimes of different sets of models. Left panel: Ratios between the lifetimes of models at different metallicities (Z = 0 (Pop III, blue), Z = 0.0004 (I Zw 18, yellow), Z = 0.006 (LMC, pink), and Z = 0.014 (solar, purple)), and those of models computed in this paper (Z = 10⁻⁵) as a function of the initial stellar mass M_ini. Solid lines: Non-rotating models. Dotted lines: Rotating models. Right panel: Ratios between the lifetimes of rotating and non-rotating models at all metallicities (Z = 0 (Pop III, blue), Z = 10⁻⁵ (this paper, green), Z = 0.0004 (I Zw 18, yellow), Z = 0.006 (LMC, pink), Z = 0.014 (solar, purple)). In both panels, the horizontal axes have a logarithmic scale.