Please review below MOS Notes:
Page Access Tracking in Oracle Applications Release 12 (Doc ID 402116.1)
The above MOS Notes should help you achieve the info you need.
Additionally, you can find the info in fnd_logins as well.
select user_id, to_char(START_TIME,'DD-MON-RR HH24:MI'), to_char(END_TIME,'DD-MON-RR HH24:MI'), round((END_TIME - START_TIME) *24 * 60,2) minutes, login_type from fnd_logins where start_time > (SYSDATE - 15) order by start_time desc
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