[RPG] How long can a Wizard hold their breath


For a 5e campaign, I have created the character Diogenes, a Human Wizard from the school of transmutation. Diogenes, in real life, is said to have possibly died due to holding his breath for too long.

I want to end my character in the same way, but (of course) with more pizazz.
Without death (but unconsciousness is OK), what is the longest that a character could survive without breathing? I am speaking of a feat that only requires oneself, and no aid, but which might involve items or methods to extend the duration.

Best Answer

The rules for holding your breath are on page 183 of the PHB.

A creature can hold its breath for a number of minutes equal to 1 + its Constitution modifier (minimum of 30 seconds).

The easiest way to extend this is to use a Bottled Breath, from Princes of the Apocalypse. This will let you hold your breath for an hour. Using Polymorph to turn into a Plesiosaurus or a Giant Octopus will likewise let you hold your breath for an hour. If you're really serious about this, though, you should turn into an air genasi. This will let you hold your breath literally forever.