Hello,
well we had a fresh, whole closed durian - and it did not smell until we opened it.
After opening, the smell wasn't very strong either and we ate it in a few minutes with 4 persons.. after that we all need to burp and THAT has stunk to heaven
later we haven't found any fresh durian in Germany and bought frozen flesh of a durian.. we couldn't stand the smell after unfreezing.
i tried to eat it but the smell was awfully disgussting so we had to junk it.
I have found information on the internet, saying the bad smell only starts to get worse if the durian is opened and the flesh has air contact - the longer it is open, the worst the smell.
but i do not have any more practically experience than mentioned above
