Prime Minister Shinzo Abe on Monday became Japan's longest-serving leader in terms of consecutive days in office, but there was little fanfare, as he visited a hospital for another checkup amid concerns about his health. Abe marked his 2,799th consecutive day in office since bouncing back to leadership in late 2012 for a second term, surpassing the previous record set by Eisaku Sato, his great-uncle, who served 2,798 straight days from 1964 to 1972.