The solid lines show the maximum extractable rotational energy, ﹩{E}_{{\rm{ext}}}^{{\rm{\max }}}﹩, for neutron stars with baryonic mass equal to M_b,TOV as a function of rotation period P. The dotted lines represent the maximum rotational energy of neutron stars at a given period. Blue and black curves correspond to the GP and ndu models, respectively. The inferred parameters of DES16C2nm (B. Hsu et al. 2021) and GRB 101219A (A. Rowlinson et al. 2013) are shown for comparison.