Well, most effective for approximately 15 seconds. It takes that long for humans to lose consciousness in space due to loss of oxygen to the mind. In 1965, a technician become inner a vacuum chamber and by chance depressurized his fit. After 12 to 15 seconds he misplaced awareness, however his healthy changed into repressurized at 27 seconds. According to Scientific American, the person recalled “the moisture on his tongue beginning to boil in addition to a lack of flavor sensation that lingered for 4 days following the twist of fate.”