no "exactly" to it but plain and simple, if it's leaking then something has failed... they aren't supposed to leak and until you find the leak you have no idea what has failed or how close it is to getting a lot worse
quick example... cracked thru hull fitting... seeps a few drops an hour till it finally pops off and then it "seeps" say, 1700 gallons per hour
OR I/O rotten bellows several years past needing replaced have a small pinhole and just drip a little till all of a sudden they rip and it starts coming in fast.....
the REALLY scary part is that for every inch lower the hole gets in the water due to boat taking on water the speed that the water comes in goes up exponentially
a 1" hole 2' under water will sink a boat in a couple minutes
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