Evolution of a CRe lifetime for different field and time values. First two panels: Lifetime of CRe as a function of their energy, based on loss processes only (blue lines) or also including the balancing effect of turbulent reacceleration and adiabatic compression (red lines) for particles in the classicalRH (top) or in the megaRH (bottom) regions. We used the (median) physical values of particle density, magnetic field strength, divergence, and vorticity for equally spaced snapshots (Δt ≈ 0.7 Gyr) in our simulation, starting from z = 1. Dashed lines are for the z > 0.5 snapshots, with solid lines otherwise. Bottom panel: Lifetime of cosmic ray electrons as a function of their energy for fixed reference values of B = 1 μG, n = 10⁻³/cm³, ∇ · v = 10⁻¹⁷ s⁻¹, and z = 0.0 and for increasing values of the solenoidal turbulent velocity.