Our holiday isn't for weeks yet.

Our holiday isn't for weeks yet.
what could this sentence mean?
Our holiday short or far away?

It means it's far away: it will still be a few weeks before it's time for the holiday.

- Kef

<It means it's far away: it will still be a few weeks before it's time for the holiday. >

What function is the "yet" in that sentense?

It adds a bit of emphasis, although it isn't necessarily stressed when said aloud. The emphasis is on how much time there is until the moment arrives.

- Kef

Looks like a massive redundancy to me.

Not to me. Emphasis isn't really redundant because it provides extra information, even if the literal meaning of the sentence may contain redundancy.

<Emphasis isn't really redundant because it provides extra information, even if the literal meaning of the sentence may contain redundancy. >

And what extra information is provided by "yet" above?

I already explained that: it emphasizes the length of time before the moment arrives. Emphasis is extra information.

To me "for weeks" expresses long duration - in the mind of the speaker. The addition of "yet" is just another example of excess.

*"Our holiday isn't for weeks yet, but later it will be for weeks."

I agree with Guest, above, it is illogical and excessive.

Comes from those who don't know how to use "yet".