a period of five nights
पंचरात्र (paṃcarātra) [Printed book page 402-23]
पंचन्-रात्र (paṃcan-rātra) n. a period of five nights. [ID=20719]
पंचन्-रात्र (paṃcan-rātra) n. a period of five nights. [ID=20719]
— Vaidya Sanskrit-English Dictionary