Heidegger's Bible Handbook: Leviticus: The Chronology of Leviticus
5. The Chronology of the book.
The Chronology of the book is completed in a single month, that is, from the erection of the tabernacle on the first day of the first month of the second year of the Exodus, to the second month of the same year, in which God commanded to undertake a census of the people, described at the beginning of the following book of Numbers.
 See Exodus 40:2.