I've got Windows 11, and I'm using the Windows version, and it's not really a time thing. Just as soon as the game starts, it's a black screen, whether I put it full screen or not. I can hear the audio, and I think I can click stuff, but other than some occasional flickers of it being visible, I can't see anything. So it seems like the game itself works, just some display issue maybe
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Ok that is odd. I haven't seen that in my Win11 install and neither have play testers. I ask because we used to have a combined Linux/Windows package but there were some things that broke in Linux.
I did find this on Renpy
https://www.renpy.org/doc/html/display_problems.html
You can try holding Shift when loading the game or pressing Shift-G once loaded.
I hope that helps.