How long does it take to decompose a tin can?

Answer 1

It depends on the status of the can.Tin cans (tin coated steel cans) will rust away within a few years if exposed to moisture,

• On camping trips it is common to toss empty cans in the fire to remove protective paint or plastic which protects the metal from oxidation to hasten the process.
  
• In dry conditions they can last for many decades.
  

Answer 2

It takes a tin can approximately 50 years to decompose. Since tin is a metal, it takes much long to decompose than organic matter like leaves or banana peel.