The 1545 is a massive speedrunning relay race where teams of runners will complete all of the games in the Super Mario 602, the Rareware 301%, and the Sprashfecta, all over the course of 3 days.
The 1545 is one of the largest single races in speedrunning, with an estimated 330 hours of gameplay time. For reference, a week-long marathon generally has about 150-160 hours of gameplay time.
Each team is expected to take just over 50 hours to complete the full-completion categories of all 13 games sequentially.
The 1545 will take place starting on July 13th, 2018 at 11pm UTC at twitch.tv/1545race and will run through the 16th, until the last team has finished.