ねんかん年間nenkan
1.

A duration spanning an entire year, often used to describe measurements or income collected within that timeframe.

2.

A specified period characterized by a particular era or year name, often associated with historical or cultural contexts.

Example:

私はここで10年間働いている。

いちねんかん一年間ichinenkan
1.

A duration that encompasses twelve consecutive months, serving as a standard unit of time measurement in various contexts.

2.

The time span in which seasonal changes typically occur, marking a full cycle of events or experiences over a complete year.

3.

The length of time dedicated to annual activities or commitments, often used to signify a complete operational or academic cycle.

4.

A specified time frame that can indicate the passage of time in personal development or progress from one anniversary to the next.

Example:

彼は東京に一年間ずっといます。

せんねんかん千年間sennenkan
1.

A duration of time that spans one thousand years, often used to signify a long historical or cultural period.

2.

A significant time frame commonly associated with monumental changes or events that may occur over a millennium.

3.

A lengthy interval that serves as a backdrop for the evolution of civilizations, traditions, and landscapes across ages.

4.

A measure of time that evokes notions of eternity or the passage of time in various philosophical or historical contexts.

すうねんかん数年間suunenkan
1.

A span of time encompassing multiple years, often indicating a duration longer than two but not specifying an exact number.

2.

An unspecified number of years, typically used to describe a period of experience or time that has notable significance.

3.

A time frame that suggests the passage of years, frequently implying a phase of development or change over that duration.

Example:

この数年間に彼は不朽の名詩を書いた。