several years, a number of 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.