A couple of minutes can put you in a lethal situation that even administration of pure oxygen will not reverse the effects.
Breathing from the exhaust exit, one would pass out after about 8 minutes
It really depends on how long it will take to kill each one.
It can take as little as a few hours.
5 years
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I got the amiba but it did not kill me so I don't know.
bout 5 mins
3 days
a fortnight
About 1-2 weeks
jerk!
about 13 days