I urge you to just lookup the schedules using something like http://www.shipmentlink.com/ http://www.shipmentlink.com/ or http://www.linescape.com/ http://www.l

I urge you to just lookup the schedules using something like http://www.shipmentlink.com/ http://www.shipmentlink.com/ or http://www.linescape.com/ http://www.linescape.com/. For one, 25 knots is a ridiculously high speed. At the same time, 12 knots is way too low. Any shipping line will sail a bit quicker on the main haul (=direction where most full containers go to). So China->Europe is usually quicker than the other way around. But the huge mistake you're making is that a container vessel will make additional stops and it does not connect every possible port to every other possible port. If you have uncommon combinations, the container will usually be moved from one vessel to another. This adds additional time (days). Hong Kong -> Fos Sur Mer is like 31+ days.