How many months does it usually take for ocean-going freighters to reach the United States from China and Shanghai?

It is 1 137 1.9 nautical miles from the Yangtze estuary to the United States by voyage instrument. If the ship speed is 15Kn, it is 360 nautical miles per day, 3 1 day, but it takes 1 month, 1 week to go to the United States.