text: at least how many days/months is needed for a human dead body to become totally skeleton?   it depends on the rate of decomposition.  example:  in warm moist areas the body will decompose quickly since bacteria thrive in those conditions. however, in dry or cold conditions, decomposition will take a bit longer.  i have seen a picture of a elephant seal that died in the tundra over 300 years ago  and it is still not decomposed.