How long can you hold your breath?

How long can you hold your breath? It's a question I don't want to know the answer to.

Scuba diving is a seemingly harmless activity saved for beach vacations, right? Sure, but commercial diving is a world of its own. Dogwood present Last Breath following a team of divers on their expedition 300' below sea level. When unpredictable weather causes diver, Chris Lemons, to detach from his life support and drift away from his diving bell, he is faced with taking his last breath. 

It's hard for me to give 100% of my attention to the TV and Last Breath had me holding my breath the entire time. It's currently streaming on Amazon and iTunes.