There is a way, but it requires modifying the source. I'll look into it to make it an easily changeable setting instead. It should be easy, so I should have something ready soon.

I made the necessary changes. I sent the updated kit to the organizer, with updated instructions on how to change this setting.

If you'd rather get the change immediately to test things you need to modify the game source (game.zip) by replacing the content of the file "say.lua" with this. After this is done, you can modify the duration of the text by adding the line (without quotes) "t.glyph_duration = 0.1" (change the value as needed, 0.1 is the default) to the file "text_translated.lua" after "local t = {}".