JOB_PRIORITY_OVER_TIME=increment/interval
Where:
increment
Specifies the value used to increase job priority every interval minutes. Valid values are positive integers.
interval
Specifies the frequency, in minutes, to increment job priority. Valid values are positive integers.
User-assigned job priority must also be configured,
JOB_PRIORITY_OVER_TIME=3/20
Specifies that every 20 minute interval increment to job priority of pending jobs by 3.