How long does it take for your body when your dead to rot away?

There is Corpse Farm in Tennessee that is attempting to answer questions like these. Bodies are stored in a number of different conditions. Anthropologists observe the rate of decay and insect successions to develop tables. In a graveyard, the California State guidelines indicate about 10 years is needed for complete decomposition. In Vietnam due to the high heat and humidity a corpse would show significant degradation overnight, on the other hand Ötzi the Iceman in Austria lasted several thousand years (3300 BCE to present) due to the dry cold conditions.