I don't know the particulars on sinking boats, but working on what I DO know (kinda

)
That boat looks to be about the same size as ours. That means it weighs somewhere around 32,000#...
That much weight displaces, at 8.3 pounds per gallon, 3855 gallons of water. Ergo, it seems reasonable that once there's that much water IN the boat, it will sink...
BUT, I don't know the particulars, what with one end lowering faster than the other. So, figuring the boat's doomed at half that much water, we're at 1928 gallons.
The boat sank within 24 hours-- that much water in 24 hours, 1928/24/60=1.33 gallons per minute... THAT is one healthy leak! But it's actually pretty close to the amount of water the 1/2" line going to my genny would let in if it for some reason came off or broke (or wasn't re-connected properly)...
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1988 SkipperLiner 53x14
1995 Tracker Party Cruiser 32 *for sale*
2003 Chaparral 260 SSI
2000 Allegro Bus 40' DP