Planning and Prep
Not doing any type of planning is one of the first mistakes people make when doing a 24 hour stream. While some streamers will randomly decide to do a stream like this out of the blue, I would not recommend it.
The first thing you want to plan is what you’re actually going to do during the 24 hour stream. If you’re a speedrunner, maybe you want to play through a lot games that you know how to speedrun. If you’re a casual/variety streamer, maybe you want to marathon through one whole game in a day, or play through a bunch of new games that came out recently! Whatever you decide to do, make sure that it’s actually something that you WANT to do for 24 hours. People forget how easy it is to get bored of playing the same game for 24 hours straight! Don’t make that mistake!
You’ll also want to plan when you’ll play each game. The last thing you want to do is play a game that requires a lot of thinking like a puzzle game at the end of the stream when you’re extremely tired. Playing games with viewers/subs for the last few hours is always a safe plan if you’re just looking for something relaxing to finish out the marathon.