れんじつ連日renjitsu
1.

Refers to a period during which something occurs continuously on a daily basis without interruption.

2.

Describes days that consistently feature the same occurrence or condition, often highlighting a relentless or repetitive nature.

3.

Indicates a series of days characterized by an ongoing event, emphasizing the persistence of that event in various contexts.

Example:

連日交通事故が起きる。

れんじつれんや連日連夜renjitsuren'ya
1.

A continuous period of time characterized by ongoing activities or events occurring every day and every night without interruption.

2.

A state of incessant occurrence, where something is happening continuously from day to night, highlighting a relentless or persistent nature.

3.

An expression indicating that an event or situation takes place repeatedly on a daily basis and extends well into the night, often implying exhaustion or an overwhelming presence.