How long can a river physically be on a planet?

How long can a river be? Are there any physical limits on its length, coming from the necessary altitude drop, the triple point of water, or other factors? You can alter whatever parameters you find necessary for the planet that contains this river. Any pressure, continent distributions, densities, diameters etc; are allowed but the river must be made of liquid water and be on the planet's surface.

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How long can a river physically be on a planet?

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