Tempus.Slot.duration

You're seeing just the function duration, go back to Tempus.Slot module for more information.
Link to this function

duration(slot, unit \\ :second)

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Specs

duration(slot :: t(), unit :: System.time_unit()) ::
  non_neg_integer() | :infinity

Calculates the duration of a slot in units given as a second parameter (default: :second.)

Example

iex> ~D|2020-09-03| |> Tempus.Slot.wrap() |> Tempus.Slot.duration()
86400