Can I put a maximum of 8 hours of holiday that will be paid despite the employee's schedule?

Summary:

I would like to only give employees 8 hours of holiday time for a holiday, even if their work schedule typically has them work more than 8 hours on a given day. I have employees that work 12 hour per day, but on a holiday I want them to take the whole day off, but their time card should reflect only 8 holiday hours that they are paid for. However, if an employee is only scheduled for 4 hours, then they should only get 4 hours of holiday pay.

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