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You can't sail from London to Cologne.
The cost of the Cologne Cathedral was started in the 13th century and halted in the 15th century. It remained unfinished until 1840 being completed in 1884. The costs were enormous but never fully accounted.
about 4 hours probaly 5
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About six and half hours. See related link.
No longer than 1 hour 30 minutes
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