the Longest Time Since...Presidential Terms

The first time a presidential term was interrupted was by the death of William Henry Harrison, the 9th POTUS. 52 years is the longest, from George Washington to Harrison 9. A presidential term can be interrupted by natural death (#9, #12, #29, #32), by an assassin's bullet (#16, #20, #25, #35), by resignation (#37) and by removal (no president has been removed from office by impeachment, two presidents have been impeached...that's another pointless presidential pfact or more so the law of the land). The second longest time, starting with the 57th presidential term on January 20, 2013, 39 years and counting, is the current period starting with Gerald Ford in 1974 and hopefully uninterrupted.

1-1789-1841 52 years - 9 POTUS, 13 terms, start of 14
1841-death #9 WHH, succeed by #10 JT

2-1841-1850 9 years - 3 POTUS, 14 & 15th terms (2), start of 16th
1850-death #12 ZT, succeed by #13 MF

3-1850-1865 15 years - 4 POTUS, 16-19th terms (4), start of 20th
1865-assassination #16 AL, succeed by #17 AJ

4-1865-1881 16 years - 4 POTUS, 20-23rd terms (4), start of 24th
1881-assassination #20 JAG, succeed by #21 CAA

5-1881-1901 20 years - 5 POTUS, 24-28th (5), start of 29th
1901-assassination #25 WM, succeed by #26 TR

6-1901-1923 22 years - 4 POTUS, 29-33rd (5), start of 34th
1923-death #29 WGH, succeed by #30 CC

7-1923-1945 22 years - 3 POTUS, 34-39th (6), start of 40th
1945-death #32 FDR, succeed by #33 HST

8-1945-1963 18 years - 3 POTUS, 40-43rd (4), start of 44th
1963-assassination #35 JFK, succeed by #36 LBJ

9-1963-1974 11 years - 2 POTUS, 44-46th (3), start of 47th
1974-resignation #37 RN, succeed by #38 GF

10-1974-present as of 2013, 39 years - 7 POTUS, 47-present which is the start of the 57th (11)