数年間

several years, a number of years

数 number; quantity + 年 age + 間 during; while
noun Rare #43,996
several years, a number of years Usually used with a verb or noun to indicate a period lasting several years.
JA: 彼は数年間ここに住んでいます。
EN: He has lived here for several years.

その後数年間では?

What about the next few years?

— オッペンハイマー (2023)

数年間辛抱しなさい

Be patient for several years.

— तुम्बाड (2018)

トムはまたフランス語を数年間勉強していた。

Tom had also studied French for several years.