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O'Donnell was allowed a 5-minute break each hour, but he used his rest time to eat and play with his dogs rather than sleep.
He finished his 78-hour, 30-minute gaming session with 80 minutes of unused rest time.
"I got physically tired, not so much mentally. I don't suffer from a lot of the typical issues when I'm awake for so long, like lethargy and hearing things. Some people start to slur their words and might even be mistaken for intoxicated -- I typically don't get any of that," he told Guinness World Records.
His gaming marathon broke the record for the longest video game marathon playing World of Warcraft, which previously stood at 59 hours and 20 minutes.
He also took the record for the longest video game marathon playing an MMORPG.