I have read that the off hand has a chance to swing when the primary hand swings. In my experience this is not the case, when using a long delay primary and a fast secondary I see the secondary swing in between primary swings.
As such, I believe the off hand attacks at its own delay, with a chance to swing each time it's delay period expires.
Also, note the off hand has a chance to proc it's spell each time it's delay expires, even if duel wield fails to produce a swing. As such, many players opt to start duel wielding with a weapon that procs (at low skill duel wield produces very few swings).
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