When the Kyoho period started, the eighth shogun, Yoshimune TOKUGAWA made a system of zenkan-reigu (to welcome retired persons to the field they had experience in) for fudai-daimyo, especially, the persons who had experience as roju in order to enhance the basis of the shogun's political support, and treated especially kindly three people, which included Nagashige together with Tadataka SAKAI and Masayuki INABA who had already retired, as the remaining persons who had experienced the previous generation and who had rich academic knowledge.
享保期になると8代将軍徳川吉宗は支持基盤強化のために譜代大名、特に老中経験者たちの前官礼遇という形をとり、すでに隠居していた酒井忠挙、稲葉正往と共に長重の3人を、前代の遺老、学識豊かな経験者としてとくに優遇した。