いっしゅうかん一週間isshuukan
1.

A span of seven consecutive days, often used as a unit of time for scheduling and planning activities.

2.

The duration of time that typically begins on one day and concludes on the same weekday of the following week.

3.

A time interval commonly utilized in calendars and timekeeping, indicating a complete cycle of days.

Example:

1週間も雨が降り続きました。

しゅうかん週間shuukan
1.

A period of seven days that typically encompasses a cycle of weekdays and weekends, often used to denote the time frame from Sunday to Saturday.

2.

A designated seven-day interval during which special events or activities may take place, highlighting the significance of that particular week.

3.

A recurring unit of time measurement that organizes days into a structured framework for planning and scheduling purposes.

4.

A thematic duration of seven consecutive days that can be associated with specific cultural, social, or personal events.

Example:

もう2週間たったら帰ります。

にしゅうかん二週間nishuukan
1.

A period of time lasting fourteen days, often used to describe schedules or durations in various contexts.

2.

The duration that occurs between two consecutive Sundays, frequently referenced in relation to events or deadlines.

3.

A common measurement of time in planning or organizing activities, equating to two complete weeks.

Example:

あと1、2週間も休めば、すっかりよくなりますよ。