The disputed “third Vetrnætr” phrase
OLD NORSE
Já, segir Guðmundur, sé eg að þú þykist vel leikið hafa en svo segir mér hugur um að rautt mun sjá í skörina fyrir hinar þriðju veturnætur.
TRANSLATION
“Yes,” says Guðmundr, “I see that you think you have done well, but I have a feeling that red will be seen in the doorway before the third Vetrnætr.”
DIRECTLY ATTESTED:
The saga uses the construction fyrir hinar þriðju veturnætur.
CONTEXTUAL:
The same or closely comparable construction demonstrably counts annual Vetrnætr in Grágás and functions as a future deadline in Jómsvíkinga saga.
MY INTERPRETATION:
I do not think this phrase can responsibly be used by itself as proof that Vetrnætr lasted three nights. The comparative evidence makes an annual reading entirely viable.
NOT ESTABLISHED:
That Vetrnætr did not last three nights. The point is narrower: this passage does not prove that it did.
QUOTED FROM:
Valla-Ljóts saga, ch. 1 in the searchable Icelandic Saga Database text.
FIND IT YOURSELF:
Search: rautt mun sjá í skörina fyrir hinar þriðju veturnætur