Comparison between the NS accretion timescale and the cavity evolution timescale, and the corresponding reduced NS mass accretion rate. The top rows show t _acc/(t _cav + t _ref) and the bottom rows show ﹩{\dot{M}}_{\mathrm{NS},\mathrm{red}}/{\dot{M}}_{\mathrm{Edd}}﹩. The three columns show the cases of m _NS = 1.4M _⊙ and s = 0.5, with B = 10¹² G, B = 10⁹ G, treated as a BH, respectively. The case treated as a BH means that the NS is set to behave as a BH without the hard surface and magnetic field, and the only energy source is the circum-NS disk.