period · expect

1. Origins, structure, and basic meaning

• Structure: 期 has 12 strokes and refers to a span of time or a designated point in time.
• Basic usage: 期間 is read きかん, and 期限 is read きげん.

2. Common pitfalls and similar expressions

• A span of time and its limit
  • 期間 is the span during which something lasts. 工事期間中 means during the construction period.
  • 期限 is the end of the allowed time: a deadline. 期限までに sets the requirement to finish by that deadline.