In this study, time is treated as a sequence of events. The concept of network time is formulated. Indicators are suggested for estimating the course of network time. The regularities of the course of time are determined for the Irkutsk–Yakutsk post road (1785–1916). A postal-temporal typology is realized for the provinces and regions of Siberia (1782–1916).Keywords: time geography, network time, postal network, postal-temporal typology, Siberia, Russian Empire.