Noun
さらいねん
再来年まで継続する二年契約を提案するべきではないでしょうか。
We should propose a two year contract that lasts until the year after next.
You have next year (来年), but then you do a year again. That's the year after next.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.