The larger the planet, the faster it will rotate, due to centrifugal forces, there is more mass spinning around. Jupiter is huge, and has days of about 16 hours. If Oddworld is truly 10 time the diameter of Earth then there will be slightly shorter days. However, days slowly lengthen. The dinosaurs enjoyed days about 30 minutes shorter than ours. Any humanb on Oddworld or Earth's distant past would experience chronic jetlag, go mad from stress and prbably die. If the scrabs don't get you first.
Mercury is samller than Earth, and has days longer than it's years. (159 Earth days per Mercury day, 88 Earth days per year)
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