How to handle absence accrual plan balance for employees working non standard working hours

Hi, we have employees working 10 hours per day and four days a week, but their standard working hours are 40 per week. Sick day accrual plan entitlement is set to be ten days at 8 hours per day (a total of 80 hours annually). We built a user-defined table to track employees using a unique job code in Oracle. When these employees submit a sick day (full day), 10 hours of sick day paid element is passed over to Payroll, and 10 hours are deducted from the sick day accrual plan balance.

What is the best practice to handle this situation? These employees are all entitled to 10 paid sick days. Deducting 10 hours per day and only accruing 80 hours annually would make them only entitled to 8 paid sick days. Is there a way for us to allow these employees to accrue sick days based on 10 hours per day? We are under Oracle version 24A, and the Time and Labour module is not implemented.