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Yup same here. My parents had both sick days and vacation days. Sick days were PTO you could use the day of, and vacation days needed to be scheduled ahead of time.

Everywhere I've worked that has either had no paid time off at all, or it has just been one bucket and you had to schedule it no less than 48hrs in advance, or they would automatically deny it. As in it would never reach a human being, the timekeeping system would just reject it outright.