Advection and thermal diffusion timescales through the envelope, similar to Fig. 11, but for an unreduced opacity κ = 1 cm²/g. Red curves show the results from run RADL27k1, which is the model of a solid-accreting core. Advection timescales are short, on the order of 10  throughout the envelope. The case without energy deposition by solid accretion (run RADL0k1, green curves) shows that advection and diffusion timescales are on the same order and peak towards the inner envelope where they become as long as 10⁴ .