3 to 5 days worth of content with a day and night mode for each? That would be between 3 * 2 to 5 * 2 so 6 to 10 scenes. I don't know if you have multiple scenes but with 4 characters you could give each 2 scenes? That puts you around 4 days total. Just trying to help you plan, dunno if it helped :)
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The plan I have for night mode is basically "free time to do pre-determined activities" so it'll be pretty bare in the demo, just a few extra content things mainly, While with day mode is where the bulk of the content and character interactions are. The two scenes per character actually works out well, one introduction scene and one characterization scene. Thank for that advice!