Evolution of a 1.4 M_⊙ NS and a 9.5 M_⊙ MS donor, commencing with an orbital period P_orb, i = 891 days. Panel (a) depicts the evolution of the accretion rate as a function of time. The blue dashed line represents the RLO MT rate for a system containing a NS with an initial magnetic field of B = 10¹³ G. Panels (b–f) illustrate the evolution of binary orbital period, donor star’s He core mass, NS accreted mass, magnetic field and spin period as a function of the donor mass. The yellow, green, and blue solid lines correspond to initial NS magnetic fields of 10¹¹, 10¹², and 10¹³ G, respectively. The red dashed line denotes the observed values of J1928+1815. Note that the required accreted mass of 0.01 M_⊙ for accelerating J1928+1815 was derived by applying Eq. (9).