the why is why
Well , here in Europe if you have a day of holiday, half a day, or even just an hour, ...
or a couple of minutes of free time you would never spend that with your boss (....the leader of the company is not your leader,... don't be so possessive).
It can happen in a desperate situation, like me last week on site (in a factory) with the chief and his friends , around even at the break time (don't tell around or I'll got sack), or in a "planned" situation,....
like for my colleague Dan, but for that you have to be born a real flunky, it's not a thing anyone can stand.