~Adam~
Legend
You travel for a few years, but at home hundreds of years passes, it will be much like a trip with no return...
Using the original formula you posted if you could convert matter to pure energy (which I personally don't think is beyond the realms of possibility) a single kilo of anything could be converted to 9 x 10^16 J of energy (3 billon times as much energy as gasoline per litre), effectively allowing you to transport entire civilisations at the same time making the time difference meaningless.
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