Home/American Shipper/Maersk, CMA slow TP3/TP9/Columbus pendulum again American ShipperShipping Maersk, CMA slow TP3/TP9/Columbus pendulum again FreightWaves Staff · Monday, December 17, 2012 Facebook Twitter/X LinkedInThe ocean carriers have once again slowed their joint weekly service between Asia and the east and west coasts of North America. Roundtrip voyage time on the loop has increased from 112 days to 119 days, or 17 weeks.