I wonder what kind of stress that would put on a planet in formation. Would you even be able to form a planet under those circumstances? And tides that drastic.. would you have /any/ land for very long, assuming the ocean will erode things faster?
Pretty much the only way I see you having land is if there is not an awful lot of ocean to begin with. IOW, you won't have land with our earth's 2:1 water:land ratio. But if you had an world of mostly land, though, there likely wouldn't be enough water to sustain life.
As for stress on the planet, I imagine you're looking at a planet kind of like Jupiter's moon Io - the stretching and pulling causes near-constant volcanic eruption and earthquakes.
I suppose that is a way to keep land masses, though... if the stresses on the planet have the planet spewing out volcanic material faster than the tide can erode it away, you'll have land masses, though one surmises that the land wouldn't be a very hospitable place. In fact, I suppose that the "inhabitable" areas might well be places in the center of a ring of volcanoes... the volcanoes keep spewing out rock and lava to ward off the effects of erosion.
Very nasty climate, but I guess it's do-able (in theory).
OTOH, you would have no port cities and intercontinental travel would be done via flying. And all water would have to come from wells - no rivers, et al.
Overall, not a world where I'd want to live.
--The Sigil
Sigil's math is more accurate, my answer comes out to the same distance and period after accounting for a factor of 2 in the Tan. Watch out for those factors of 2!
