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# Cadence & Duration

A billing term needs certain data to define the cadence (how often) and duration (how many) of invoices that it generates.

**Invoicing start date** Required: The date the first billing period begins. Usually the same as the revenue start date.

**Interval unit** Required: The unit of your billing cadence: `NONE`, `HOUR`, `DAY`, `WEEK`, `SEMI_MONTH`, `MONTH`, `QUARTER`, `YEAR`.

**Interval frequency** Required: How many of the above units between each invoice. 3 + `MONTH` = every quarter.

**Duration (number of invoices)** Optional: Total billing periods to generate. Defaults to 0 (open-ended, no end date). Combines with "isRecurring" to determine the end date.