Could be an announcement like "Hey guys, tomorrow you have the day off on us. Have fun!" at the end of the work day or whatever.
Saying "you get one day PTO to use whenever you want" is of course better, but sometimes unplanned free time is nice too. Both would work fine imo.
As a 20 year old, I have both :')
Still want to do uni and make a name for myself, achieve some cool things for the world & humanity, but at the same time I feel like just "making the most of it," and try being content just messing around with electronics and FOSS in my free time... But I guess that can just be my back-up if university doesn't pan out.