I have a game that looks like it might not end until an opponent runs out of holiday days, so was curious.

If not then no big deal.

Player's profile page should show returning date from vacation. Is that what you were after?

Not really. Returning date has been moved forward four or five times since the last move. 

I know you have 30 vacation days a year if you're premium and paid for a year. Was just curious if there was any way for other players to see how much of that is left.  I guess probably not, but you don't know for sure unless you ask, right? (or if you're good at finding that sort of information yourself, which does not apply to me).

I don't think there is - but it's hard to prove a negative.

Only the user and an admin with enough clearance has access to that data.

There should probably be a limit to how much vacation one can take in a row, though. In theory, one can be on vacation forever if you keep purchasing more premium time, no?

Hmm, If I win the lottery, maybe I'll buy a century of premium, join a bunch of games and then go on vacation for a few years.