Actually taking 30 minutes to coast to a stop sounds quite resonable. This is what makes large boats such a trick to handle. Remember it takes nearly 4 miles for a mile long train to come to a full stop, and that is using breaks. A boat is 2000 or more tons of metal and machinery, and men, that is a whole lot for drag of the water to stop on its own.
A boat is much like a tail dragger aircraft. It is not finished moving until it is tied down.
From my understanding about subs is that they don't want to stop once moving. Remember in hunt for Red october during the Crazy Ivan scene, Jonesy had to explain to the trainee that the trick of it was that a boat like this doesn't exactly stop all by itself, so if the Ruskie slows down, the pursurer would crash right into the Boomer's stern.
That last bit of kenitic energy can and should take an eternity to bleed off, which is modeled in this game quite well.
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