I Just Found Out How Long A Plane's Oxygen Mask Actually Lasts, And I'm Slightly Terrified

We’ve already shared at HuffPost UK which parts of the plane are secretly the filthiest, as well as the seats flight attendants would never choose. 

We’ve even revealed that flight attendants don’t just greet you onto a plane to be polite ― they actually have a secret side quest.

But even that hadn’t prepared me for the fact I recently discovered on Reddit – then rushed to verify ― oxygen masks really, really don’t work like I thought they did. 

More specifically, they offer a lot less of the precious gas than I thought.