Most people consider planning a wedding one of the most stressful things they will ever do. In fact, a majority of American couples take their time with planning, and most spend an average of 16 months engaged before the big day, according to research from The Knot. However, on "Married at First Sight," participants don't get the luxury of taking their time arranging their dream day. "I only had about two weeks to plan my wedding," Sonia Granados, who tied the knot on the American series in Season 4, revealed to Cosmopolitan.

According to another contestant named Clark, who appeared on the U.K. series in Season 2, couples only get six choices when it comes to the food, theme, and music they've dreamed of having on their big day. They're also quite limited when it comes to their guest lists. "I was only allowed to invite 20 people," he told Cosmopolitan. "It definitely caused some friction with some of the family members!"

When the wedding day does eventually roll around, every single guest is required to sign a nondisclosure agreement — no matter how excited grandma may get. "No one can post on Facebook the next day, 'My daughter got married!'" Granados explained.

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