Since the concept of deformation duration of ductile faults was proposed, certain of progress were made. There were three approaches to the issue: reaction rate method, diffusion rate method and strain rate method. The recent work indicated that the durations achieved by strain rate method and finite strain measurement method were both of the order of 104 years, and they decreased gradually with the mylonitization in the same ductile shear zone. As to the different shear zones, although the durations were also of the same order, there were differences among them and they were caused by the conditions of tectonic dynamics. The durations given by strain rate method had a good consistence repeatability, and indicated the feasibility of the approach. There were still some arguments in the determination about thickness of thin-section, immobile components, deformation temperature and the most suitable paleopiezometer. This article presented a deep discussion on the influences of volumetric factor and mylonitization degrees on deformation duration, and the perspective on the study. The relevant study at present is still in the period of exploring, and is only confined to half-quantitative analysis. It requires deeper and more delicate research, and development in microstructural geology and tectonitic petrology.