Worth noting that 6000 cycles of the most extreme hypothetical 180 mile round trip would take 15 years, assuming the ship always travels at its max speed of 10

Worth noting that 6000 cycles of the most extreme hypothetical 180 mile round trip would take 15 years, assuming the ship always travels at its max speed of 10 knots, and always charges and discharges at its max rate of 0.33C. Realistic load and duty cycle would be much less than that, so lifetime would be multiples. This ship may or may not have a plausible use case, but it doesn’t sound like cycle life would be the limiting factor.