Home/Cruising/How long until your Waste is decomposed in the Water? INFOGRAPHIC CruisingPhoto of the weekUSA How long until your Waste is decomposed in the Water? INFOGRAPHIC 16 May 2018 Less than a minute Facebook Twitter LinkedIn Pinterest Reddit WhatsApp Share via Email Print If one bottle of water made it into the sea, how long would it take to fully decompose? An example? Plastic bags we use in our everyday life take 10-1000 years to decompose, while plastic bottles can take 450 years or more.