it can last for as long as you can hold your breath. after that time you have 3 minutes before you pass out.
A long long long long llllllllllllllllllllllllllllllllooooooooooooooooooooooooooooooooooooooooooooonnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnggggggggggggggggggg time.
A person can last 4 minutes without oxygen, longer in extreme cold. It takes that long for the body to use up the oxygen in the blood.
An ML6 oxygen cylinder, when "charged" to normal pressures, holds 170 liters of oxygen. How long that will last depends on a number of factors. If the flow is set to 2 liters per minute continuous then it will last less than 1 and 1/2 hours. If an oxygen conserving device is used (they give the gas in pluses when breaths are taken) it can last over 4 hours.
6 seconds
20 minutes
The is not enough information to answer this. We need to know what is burning, how much, and how fast, and how much oxygen we have.
It is not toxic but because it takes up space it can displace oxygen and we can't last long breathing an atmosphere without oxygen.
Until the fuel or oxygen is all consumed, whichever comes first.
Not very long, maybe a few days. That's because the higher the temperature in the water, the less oxygen. Eggs need oxygen to survive.
Combustion or burning requires oxygen of the air. So, if there's no air, the flame will extinguish immediately because there's no oxygen.
Simple: People cannot stay in space for a long time because although they have stored oxygen, it cannot last forever. Eventually they will lose all oxygen, and if they have not returned to earth before their oxygen runs out, they will die.
About 2 minutes, the same as you would last not breathing oxygen.