Evolution of the total mass of solids (M_sld) in circumplanetary accretion disks of several test planets at 5.2 AU from a Sun-like star. Colored dots along the mass evolution tracks indicate accretion rates (Ṁ). If moon formation around all of these planets shuts down at comparable disk accretion rates (Ṁ_shut), then M_sld(Ṁ_shut) ∝ M_p (see also Fig. 5 in Heller & Pudritz 2015). Compared to a Jupiter-mass planet, a 12 M_Jup planet would then have 12 times the amount of solids available for moon formation.