Duration of Case A mass transfer (Δt_A) in logarithmic years as functions of initial orbital period P_ini with the initial donor mass M_ini colour-coded (top) and as functions of the initial donor mass, where models with the same initial orbital period are indicated with the same colour (middle). The bottom panels show the ratio of the Case A donor core hydrogen-burning lifetime t′_MS to the core hydrogen-burning lifetime t_MS of a single star of the same initial mass, as a function of the initial orbital period and in the top plots we indicted in black its interquartile range. Each cross represents the median value of Δt_A across different initial mass ratios. In the top plot we indicted in black the first and third quartile. Grey lines indicate our best fit to the data. The panels on the left show LMC models and on the right is SMC.