Guests attending Jeff Bezos and Lauren Sánchez’s days-long, $50 million wedding lineup in Venice were allegedly left exhausted halfway through the extravagant affair.

“What people won’t know from the pictures is how exhausting and full-on it was for the guests,” a source told the Daily Mail on Tuesday.

The insider noted that the summer heat — as well as the constant back and forth between venues —made the entire over-the-top itinerary difficult for attendees to get through.

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“The heat didn’t help but people were forever needing to get around Venice, which means by boat, and that was a hassle and took ages,” the source said.

“And there were a lot of people who all needed to get to the same place at the same time,” the source added.

A-list invitees were allegedly grumbling about the less-than-restful schedule of events.

“People were complaining about being completely tired by the time of the wedding day, never mind the day after,” the source alleged.

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Festivities kicked off last Thursday night with a welcome dinner at the Madonna dell’Orto Church in Cannaregio, as guests were spotted arriving via water taxis and boats, including the bride and groom.

Sánchez stunned in a structured gold Schiaparelli haute couture gown with floral embellishments for the first lavish soirée.

The next day, the Amazon founder, 61, and Sánchez, 55, said “I do” at the breathtaking basilica on San Giorgio Maggiore island. The “Fly Who Flew to Space” author looked glam in a corseted, long-sleeve lace gown by Dolce & Gabbana for their nuptials.

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The celebrations continued into Saturday with a luxurious pajama party where performers included Usher and DJ Cassidy.

A slew of celebrities were present at the three-day affair, including Mick Jagger, Oprah Winfrey, Leonardo DiCaprio, Sydney Sweeney, Jerry Seinfeld, Orlando Bloom, Jessica Alba, Bill Gates, Brooks Nader and Ivanka Trump.

Also present were Kim Kardashian, Kylie Jenner, Kendall Kenner, Khloé Kardashian and Kris Jenner.

A source told Page Six last week that Kris allegedly pushed for Khloé, Kendall and Kylie to be invited to the wedding.

“Originally, the quintet was going to be a duo of just Kim [Kardashian] and Kris,” our source said, adding, “But Mama Kris asked Lauren if she could bring the other three when they were in Paris for the bachelorette party.”

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The insider added that Sánchez barely knows Khloé, Kendall and Kylie “outside of simple pleasantries.”

Kris and Kim notably attended Sánchez’s opulent Parisian bachelorette in May.

Sánchez and Bezos got engaged in April 2022 on the Blue Origin founder’s $500 million superyacht after dating for five years.