You can set a planned_duration (in seconds) when you create the job.
<planned_duration>7200</planned_duration>We then have an actual_duration field that measures the total elapsed time for completed jobs from start to finish in seconds.
<actual_duration readonly="readonly">8132</actual_duration>We also show a worker_duration which is the total elapsed time for completed jobs, minus any time the job was paused. This is shown in decimal hours and is useful for recording billable time. This is the value we use when adding time to invoices.
<worker_duration>2.31</worker_duration>