The time in which a certain viscosity or yield stress is reached after discontinuation of a shear. These times depend on the values of viscosity or yield stress chosen by the experimenter.
PAC, 1979, 51, 1213. 'Terminology and Symbols in Colloid and Surface Chemistry Part 1.13. Definitions, Terminology and Symbols for Rheological Properties' on page 1217 (https://doi.org/10.1351/pac197951051213)