In September of 2000, University of Waterloo cooks made a
submarine sandwich 500 feet long. the bread was baked in a solar
oven and had to be all a single piece of bread to satisfy the
Guiness' World Record.
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More answers
The world's longest sandwich was over 2,411 meters (7,910 feet) long. It was created in Lebanon in 2011 and took more than 100 chefs and volunteers to make.