How much time does it take for a drum to be destructed?

Question: How much time does it take for a drum to be destructed?
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Asked by Quique to Stuart on 10 Mar 2016.
- Stuart Atkinson answered on 10 Mar 2016:
  
  The largest drums we collect are 200 litres – if we burn them they stay in the kiln for about an hour until all the contents are fully destroyed.

Question: How much time does it take for a drum to be destructed?