The period of the prayer or practice is separated into three parts; Kaibyaku (literally, to start from zero), Chugan (literally, the middle of term of a vow; also called Chunichi) and Kechigan (literally, expiration of term of a vow).
祈願や修行の期間は、開白（かいびゃく）・中願（ちゅうがん、中日とも）・結願（けちがん）の3つに分けられる。