長ながい間あいだ

な

が

い

あ

い

だ

Meanings

1

for a long time; for quite some time; long interval

Used as an adverbial phrase or noun to indicate a long duration. Often appears with particles like に or の, or as a standalone adverbial.

まし

た

。

Thank you for everything over the long time you've helped me.

彼かれは長ながい間あいだ、海かい外がいで暮くらしていた。

He lived abroad for a long time.

長ながい間あいだの努ど力りょくが実みを結むすんだ。

His long-time efforts bore fruit.

長ちょう時じ間かん
長時間 is a formal, often technical/business compound noun for 'long hours', while 長い間 is a more general, everyday phrase for a long duration.
長ながらくN1
長らく is a literary/formal adverb meaning 'for a long time', often used in polite or written expressions, whereas 長い間 is more neutral and conversational.
久ひさしぶりN5
久しぶり highlights the feeling of 'it's been a while' since something last happened, often used as a greeting, while 長い間 simply describes the length of the duration itself.
しばらくN4
しばらく usually implies a shorter, indefinite span of time ('for a while'), whereas 長い間 emphasizes that the duration was notably long.

Compound of 長い (long) and 間 (interval, period). A straightforward phrase with no unusual historical derivation.