Notwithstanding gellyfish's excellent diversion, there is no "longest" way to do it. You can always add another semi-colon.
On the other hand, once you whittle a solution down to the empty string, I'm reasonably sure* that nothing shorter will show up.
And for the longest contest, after the first few TB solutions, we'll all grow tired of waiting for the latest entry to download.
* Solutions by TheDamian excepted.
-QM
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Quantum Mechanics: The dreams stuff is made of
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