How long plastic items last in the ocean.

Due to the increased volume of plastics in the ocean, decomposition has slowed down. The Marine Conservancy has predicted the decomposition rates of several plastic products. It is estimated that a foam plastic cups will take 50 years, a plastic beverage holder will take 400 years, a disposable nappy will take 450 years, and fishing lines will take 600 years to degrade.

https://en.wikipedia.org , Union for the mediterranean