Temporal evolution of the luminosity (upper left), the radius (upper right), the entropy above the core (lower left) and the mass averaged Θ_e-factor in the envelope (lower right) for hot start objects with masses varying from 10 M_J to 30 M_J using our fiducial model as defined in Table 1. The black dashed line in all plots corresponds to the 13 M_J object. The masses corresponding to the individual lines are indicated in the plot. The horizontal green line in the plot of the radius indicates the position of 1 R_J.