But 5 hours of hovercraft time seems even more impractical. They would be easy to spot.
Yes, i completely agree with you. In fact, any nation in East Asia developing a hovercraft to be used in the Sea of Japan -- is absolute stupidity. It would be destroyed.
Now, if they develop these crafts to be used say, in South East Asia, where the nations there have a very weak naval force and limited interdiction capability, it would make sense.