Radium 20K
Night and daytime are roughly equal 12 hours/12 hours; sunrise and sunset are very quick (half hour or thereabouts). In my observations, anyways...
This goes for both islands in the tropics (ie coastal areas, so nothing to block the sun until it's below the water horizon), and being completely inland, where there has been mountains/terrain to create early shadows..
That said, I have never seen a sunrise or sunset period under the water -- for me it's always been midday for the diving or snorkeling, (so far, anyways [img]smile.gif[/img] ). So I don't know how long the subdued intensity lighting would be under the water. For all I know it could be totally different.
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