一日不见，如隔三秋

Explanation: One day gone, as if after three years. Describe the feelings of longing is urgent. 　　Usage: Complex sentence; as object, attribute, clause; describe the feelings of longing very urgent 　　Source: "Book of Style Ge Wang," One day not seeing, such as the San Qiu Xi. " Thesaurus:  very short time, A day absent from you is like three seasons