How long does iron take to rust indoors and plastic to break down?

Question

I have a few things indoors, they are about 5 years apart and some are more rusted than others. so how long does it take for iron to rust indoors away from water? and what about plastic?

Answer 1

Iron indoors would depend on the humidity level and plastics made today are expected to be around for at least 22,000 years, when exposed to the elements.