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I don't think a daycycle is necessary. The timeline implies Abe made his way through both Paramonia and Scrabania throughout the day and made his way back to the Free Fire Zone by nightfall. The light schemes in the levels were already pretty self-explanatory. However, I did feel the lighting in Scrabania was meant to be either a sunset or sunrise.
I think the addition of a setting sun at some point before Abe gets his hand scars would be a nice touch, and bring it all full circle.
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That being said, in the first cut scene where he uses the Shrykull power, it's night time. Perhaps he got his scars in the late evening and shut down Rupture farms by midnight or something.