I have released custom night for Infinite Night at Gmod REWRITTEN as well as a setting for the options menu. 3/20 is faded out as you need to beat it to get it.

Custom night lasts to 6AM in which if you win, and it's 3/20 you will get the star. Meaning you can create your own challenges! Each AM is a minute long so survive as long as you can! Enjoy!