noun
open period; publication period
Refers to the time window during which something is open to the public, such as an exhibition, application, or data release.
この展覧会の公開期間は来月の末までです。
The open period for this exhibition is until the end of next month.
データの公開期間が延長されました。
The publication period for the data has been extended.
Compound of 公開 (こうかい, 'open to the public') and 期間 (きかん, 'period').