This particular plant does not have the strong carrion smell as it is sometimes described. Being outside, it isn't noticable at all but does attract flies to pollinate itself (which is what it is supposed to do). If it were contained in a greenhouse while in bloom, the smell might be more pronounced. I might not want to attract flies in there either.
The flowers last around three days when fully opened, but the buds take a couple of weeks to develop and bloom. They are very interesting to watch. They start out so small and end up so big. The two buds in the photo started to open yesterday and should be all done by the time cold weather arrives this weekend.
This particular pot is only in its second year ... from 3 or 4 small cuttings. Fast grower. And it thrives on neglect. I love these things!