unaccounted for time in a tkprof output

I have this on otn. I didn't want to copy it to email since I can't properly
format the tkprof outputs.

How do I have extra elapsed time with out wait events to account for it? I
am trying to figure out why inserts take longer in production and I don't
have a wait to go on.

http://forums.oracle.com/forums/thread.jspa?messageID=3683942#3683942

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