Check how rollback is going after killing session
                                                 Last update (2008-02-20 20:51:36)
                                                                                                                   Date added (2008-02-14 14:14:17)

Summary
If you kill a session and has uncommited transactions you must wait until rollback. To find how rollback is going execute
SELECT used_ublk FROM v$transaction 
WHERE ADDR IN (SELECT TADDR FROM v$session WHERE SID = 1686) 
where sid, is the sid of the killed session

If there is a value there, this is the number of undo blocks used by the transaction. Wait one minute and again. If it is decreasing, a rollback is occuring and based on the difference between these values, you can "guesstimate" the time required to complete the rollback.
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