Continuously focusing on the work and doing without interruption is the attitude of some people. But, some people hardly complete their work on time and prepare themselves for the next work.
Doing constantly for decades without break and creating volumes of work with excellence is the essence of leadership.
Value addition to the work and making things happen is the attitude of a leader.
A leader is engaged and involved in his work without self interest and creating results of his work with excellence is the tribute to leadership.