diff --git a/yuthon_holiday/models/inherit_hr_leave.py b/yuthon_holiday/models/inherit_hr_leave.py
index e60e7294a..14e5274af 100644
--- a/yuthon_holiday/models/inherit_hr_leave.py
+++ b/yuthon_holiday/models/inherit_hr_leave.py
@@ -1117,7 +1117,15 @@ class HolidaysRequestBatch(models.Model):
 
             # 5. 扣减有效待提交额度（优先扣上年）
             for leave in valid_pending_leaves:
-                leave_days = leave.number_of_days_display or 0.0
+                start_datetime = leave.date_from
+                end_datetime = leave.date_to
+                if not start_datetime or not end_datetime:
+                    leave_days = 0.0
+                else:
+                    time_diff_seconds = (end_datetime - start_datetime).total_seconds()
+                    time_diff_hours = time_diff_seconds / 3600.0
+                    leave_days = round(time_diff_hours / 8, 2)
+
                 leave_type_name = leave.holiday_status_id.name
                 if leave_type_name not in leave_type_mapping or leave_days <= 0:
                     continue