N4 — outside your level filter
数+年間
Needs a numeral in front of it and takes no だ/です, so there are no forms to conjugate.
年間
nenkan(period of) a yearN4counter
Example sentences2
この街に三年間住んでるよ。
kono machi ni sannenkan sunderu yo.
I've been living in this town for three years. casual
契約期間は五年間です。
keiyakukikan wa gonenkan desu.
The contract term is five years. neutral