How long does someone have to hold their breath to pass out while doing the shallow water blackout?

[purplesky9]

You're supposed to hold your breath after hyperventilating. This will make you pass out and then you can drown painlessly.

 

[Praestat_Mori]

A few seconds I would say.

Anyone know of any other videos like this?

I’m trying to find other videos like this one on how to make yourself pass out, similar to the choking game / blackout challenge. Thank you!

sanctioned-suicide.net

 

[EmptyBottle]

wow, a few seconds? I'd have assumed it be longer

 

[purplesky9]

I was thinking maybe a couple of minutes

 

[Intoxicated]

My maximum underwater time was about 4 minutes with the lungs fully filled with air, and I suspect that the near-blackout state I had by the end of submerging back then might be at least partially caused by excess of CO2, because I've dealt with a strong urge to breathe which disappeared prior to apparent clouding of consciousness. Fainting in a couple of minutes looks like a too optimistic estimation for me. After a normal (not maximum) exhale with prior hyperventilation I can hold my breath comfortably for 2 minutes and after that about 20 - 30 seconds feeling the need to breathe, without any sign of transition to unconsciousness during the whole period of breath holding. I didn't allow any physical activity during the experiments though, and may be it could significantly shorten the time required for achieving a blackout.