It doesn’t have to be one day. There are several things to cut your teeth on- I don’t get as much feedback as I’d like, but even the little bit is helpful. A couple to check out:
I know they didn’t have this one last year, I’m hoping it is still going on. It helps me work on my conciseness in design. All of the earlier entries are on the site to give an idea of the vast range of designs.
http://www.game-chef.com/
Another one that didn’t run last year- I’m hoping it comes back this year. They give a theme and three ingredients and you go to work! What I like about this one is the feedback in judging. The judging is a bit skewed as those that read yours have to nominate, and there are a wide variety of tastes. But I don’t design to win.
There are also several on RPG Geek, including one running now:
Announcing the 2021 24 Hour RPG Supplement Contest
What’s it all about?
The challenge is to design and produce a role-playing game supplement in a single continuous 24 hour block of time. This is a strict time limit. As soon as you start, you have exactly 24 hours to do your work, and at the end of that time it’s done and you should submit it.
There must be no advance preparation work. All of the work (designing a system, a setting, creating fiction, artwork, typesetting) must be done within the 24 hour block of time.
It must be original work. Don’t use anything you’ve worked on previously. However, this rule gets bent a little for a supplement contest: You are encouraged to work within a prior game system. (Generic supplements are okay, however!) This means that we have to be a little careful about intellectual property concerns. It’s okay to use publicly available materials to create an adventure within another game system. Fair use applies here.
It must be all your own work. You must not get any help (whether that be design, editing, production, or artwork) from someone else. The sole exceptions to this are:
that you can use public domain / Creative Commons art for your document
that you can include a small amount of public domain / Creative Commons text for mood setting only (any quoted text must be properly attributed, and must not be a substantial portion of the entry’s text)
and that you may include this logo if you so desire (click on the image for higher resolutions):
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(Side note: I have terrible graphic design skills so won’t try. However! If someone wants to create a 24 hour RPG supplement exclusive logo, I won’t look askance on the endeavor. In fact, I’ll probably flip you a healthy amount of GeekGold.)
By entering the contest, you consent to having your work loaded onto RPG Geek as a downloadable file. The preferred file format is PDF, but if you have other more creative ideas then that’s probably fine too. If you can’t create PDFs, send your document as is to robbbbbb and he’ll convert it for you.
It’s a great opportunity to just get something banged out. 24-hours isn’t a long time, and that’s the point- you get an idea, get it done and get it out there. I find it helps, and some of my best work has been for this contest.
Just give it a try!