  Recently measured lifetimes of the favored $\alpha$ decays from $^{257}$No
have been calculated using the quantum mechanical tunneling within WKB
approximation using microscopic nuclear potentials. Results obtained assuming
previously assigned (ambiguous) parent spin of $\frac{7^+}{2}$ and newly
assigned configuration $\frac{3^+}{2}$ [622] have been compared. Hindrance
factors for the favored decays have also been compared with the calculated
hindrances using higher angular momenta transfers. Although the calculations
substantiate the findings, yet it makes the spin-parity assignment of
$\frac{3^+}{2}$ for the ground state of $^{257}$No less definite.
