How to handle work schedule and partial day logic in duration formula?

Summary: On the basis of requirement for Vacation - PL absence type, we are submitting leave for more than 1 day. But from the balance system is only deducting 1 day of leave which is the start date of our leave.

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/******************************************************************************

FORMULA NAME: UL_PL_VACATION_DURATION

FORMULA TYPE: Global Absence Type Duration

DEFAULT FOR IV_START_DATE IS '4712/12/31 00:00:00' (date)

DEFAULT FOR IV_END_DATE IS '4712/12/31 00:00:00' (date)

DEFAULT FOR IV_START_TIME IS '00:00'