Evolution of the planetary mass as function of time, based on the snapshot accretion rates of our hydrodynamical simulations (black curve). Red circles mark the masses where hydrodynamical simulations were performed. The measured accretion rate of each simulation is indicated by the orange slope segment. Growth from a 15M_E-planet to a Jupiter-mass planet is completed in about 2 × 10⁵ yr. The grey dashed curve represents the 1D model, illustrating a significant fraction of envelope growth may be spend at low envelope masses.