How long does it take for a non$-$brownian cylindrical particle of aspect ratio L$/$d $=10$ suspended in a viscous liquid to rotate through an angle of $\backslash$pi radians in a shearing flow at a shear rate $\backslash$gamma $.$it $=1$ sec $^-1?$ How long would it take if the aspect ratio$$L$/$D$$were$100?$