here is from v$session_wait:

EVENT WAIT_TIME SECONDS_IN_WAIT
------------------------------ ---------- ---------------
pmon timer 0 8197
rdbms ipc message 0 18
rdbms ipc message 0 3
rdbms ipc message 0 15
rdbms ipc message 0 0
rdbms ipc message 0 1
smon timer 0 62
rdbms ipc message 0 214
rdbms ipc message 0 4943
rdbms ipc message 0 30
rdbms ipc message 0 4566

EVENT WAIT_TIME SECONDS_IN_WAIT
------------------------------ ---------- ---------------
SQL*Net message from client 0 87
library cache lock 0 8487
SQL*Net message from client 0 1673
library cache lock 0 2256
library cache lock 0 9692
library cache lock 0 8971
SQL*Net message from client 0 3
SQL*Net message from client 0 945
SQL*Net message from client 0 6000
db file sequential read 1 66308
library cache lock 0 8861

EVENT WAIT_TIME SECONDS_IN_WAIT
------------------------------ ---------- ---------------
SQL*Net message from client 0 1673
library cache lock 0 1896
library cache lock 0 8911
library cache lock 0 7020
library cache lock 0 14339
db file sequential read -1 73926
library cache lock 0 6263
library cache lock 0 6426
db file scattered read 0 0
SQL*Net message from client 0 7646
library cache lock 0 7911

EVENT WAIT_TIME SECONDS_IN_WAIT
------------------------------ ---------- ---------------
library cache lock 0 2562
library cache lock 0 7919
library cache lock 0 3
library cache lock 0 10958
library cache lock 0 6835
SQL*Net message from client 0 4322
library cache lock 0 8971
library cache lock 0 6852
library cache lock 0 7467
SQL*Net message from client 0 746
SQL*Net message from client 0 1703

EVENT WAIT_TIME SECONDS_IN_WAIT
------------------------------ ---------- ---------------
SQL*Net message to client -1 0
SQL*Net message from client 0 10001
SQL*Net message from client 0 6610
library cache lock 0 7859
SQL*Net message from client 0 1651
library cache lock 0 2622
SQL*Net message from client 0 2658
library cache lock 0 6806
SQL*Net message from client 0 1
library cache lock 0 1056
library cache lock 0 7737

55 rows selected.