長ながきにわたる

expression, godan verb (-ru)

long (time); longstanding; for a long time

Describes a period or state that has continued for a long time. Often used in formal or written contexts.

• 両りょう国こくの友ゆう好こう関かん係けいは長ながきにわたって続つづいている。

  The friendly relations between the two countries have continued for a long time.

• 長ながきにわたるご支し援えんに感かん謝しゃいたします。

  We appreciate your long-standing support.