Which of the first five dynasties lasted the longest

1. Later Liang (June 1, 907-23) (16 years)

2. Later Tang (923-36) (13 years)

3. Later Jin (936-47) (11 years)

4. Later Han (947-51 or 979, depending on whether Northern Han is considered part of the dynasty) (4 years or 32 years)

5. Later Zhou (951-60) (9 years)

These are the first 5 dynasties, so it would be the Later Liang dynasty or the Later Han dynasty if Norther Han was considered to be apart of it.