Bulb echinolabium is not too bad as odor goes. At certain times the flower has what I call a dead fish/salt water odor. Not too different from the smell around a pier where fishing boats tie up in a Gulf coast bay or bayou. You generally have to stick your nose in it to smell it. At most times, I can detect no odor at all. Mine are in a GH so I have no idea how it might smell up the air in more stagnant home environment. My guess is not too bad or too long.
It is one of the easier bulbos to bloom and one of the best blooms. Get one for sure.
Here's mine
Bulb echinolabium LUR_4618 on Flickr - Photo Sharing!