The most often used time-line for distinguishing a transient seed bank from a persistent seed bank is one calendar year. Thus, species whose seeds live in or on the soil for 1 year after maturity to come out of dormancy in nature. We discuss modifications of the seedling emergence method for detection of a soil seed bank, so that they correspond to our definitions of seed-bank strategies.
Walck, J., Baskin, J. M., Baskin, C. C., & Hidayati, S. (2005). Defining transient and persistent seed banks in species with pronounced seasonal dormancy and germination patterns. Seed Science Research, 15(3), 189-196. https://doi.org/10.1079/SSR2005209