noun
blank period; gap; interregnum
Refers to a period of time with no activity, record, or presence, such as a gap in employment, a historical interregnum, or a window period in medical contexts.
履歴書に空白期間があると、面接で説明を求められることがある。
If there is a blank period on your resume, you may be asked to explain it in an interview.
この病気には感染から発症までの空白期間がある。
This disease has a window period between infection and onset.