In addition to the accounting log and actlog, you can also check the summary
table for recent entries (in 3.7 and later, I believe).

>select entity, start_time, end_time-start_time as elapsed_time from summary
where ....

>select colname, remarks from syscat.columns where tabname='SUMMARY'

COLNAME                REMARKS
------------------     ------------------
START_TIME             Start time
START_TIME             Start time
END_TIME               End Time
ACTIVITY               Process or Session
                        Activity Name
NUMBER                 Process or Session
                        Number
ENTITY                 Associated user or
                        storage pool(s)
                        associated with
                        the activity
COMMMETH               Communications
                        Method Used
ADDRESS                Communications
                        Address
SCHEDULE_NAME          Schedule Name
EXAMINED               Number of objects
                        (files and/or
                        directories)
                        examined by the
                        process/session
AFFECTED               Number of objects
                        affected (moved,
                        copied or
                        deleted) by the
                        process/session
FAILED                 Number of objects
                        that failed in
                        the
                        process/session
BYTES                  Bytes processed
IDLE                   Seconds that the
                        session/process
                        was idle
MEDIAW                 Seconds that the
                        session/process
                        was waiting for
                        access to media
                        (volume mounts)
PROCESSES              Number of
                        processes used
                        for process
SUCCESSFUL             Successful ?
VOLUME_NAME            Volume Name
DRIVE_NAME             Drive Name
LIBRARY_NAME           Library Name
LAST_USE               Last Use