Typical duration of a microlensing event for a stationary source at infinity by a solar‐mass lens (assuming the mean rms velocity of eq. [15]), as a function of angular separation ﹩\theta =x_{i\mathrm{BH}\,}\theta _{\infty }﹩ from Sgr A﹩*﹩. Curves are shown for different magnification values ﹩A﹩, comparing stars in the shear field of the BH (full lines) with isolated stars moving at the same velocity (dashed lines).