Durations of the different Cepheid phases for masses at which at least one of the four (Ledoux, Schwarzschild, rotating, non-rotating) models has a Cepheid phase. We distinguish between the first crossing (redward crossing of the Hertzsprung gap after the MS), the second crossing (blueward during the blue loop), and the third crossing (redward during the blue loop). These three moments are indicated in the small top right inset by coloured lines and dots with corresponding colours. Left panel: non-rotating model. Right panel: rotating model.