In my last job at a state university, we could accrue sick leave indefinitely and vacation leave up to 400 hours that would roll over. I hoarded for maternity leave like a squirrel. I know it’s a liability.

Companies don’t want to accrue time past the year in which you earn it because it’s a liability for them.

But I worked briefly for the State of California decades ago. They let you accrue time as long as you wished. Then when you retired, you got paid for whatever you’d accrued. I knew people who got paid for a full year of time at retirement. The nice thing was that you might have saved days in year one, but you were paid based on your final salary which usually was much higher.