id     LogOutTime
------------------------------
8563   2017-11-21 09:21:28.330
7961   2017-11-21 09:22:40.627
7961   2017-11-21 09:26:48.507
8563   2017-11-21 09:29:05.977

id     LogOutTime
------------------------------
7961   2017-11-21 09:26:48.507

SELECT MAX(LogOutTime) AS MaxLogOut,
       id
FROM table1
GROUP BY wrkmh_assoc_id_emp

SELECT MIN(table2.MaxLogout)
FROM (SELECT MAX(LogOutTime) AS MaxLogOut,
             id
      FROM table1
      GROUP BY wrkmh_assoc_id_emp) AS table2