I did it for 2mins and 5seconds without cheating…
Without hyperventilating, just over a minute. With hyperventilating, over 2 min.
Don’t do it!!! You will pass out and die!!!
I can do it for over an hour with cheating.
A revealation - There’s no point in doing that !
Yes, holding your breat just for the heck of it (and hypeventilating to do it) was dumb, but so were a lot of things I did in my youth. And Greenie - hyperventialting might make you pass out, but as long as you’re not underwater, not a problem. Once you’re out, you start breathing again (it takes a conscious effort to “not” breathe).
But yeah, it’s dumb.
I guess the wait for the results is making us do such crazy stuff, I could guess that OP must be a L3 candidate awaiting results without looking at his candidate status 
Does anyone else find it far easier to hold your breath underwater than when you are not underwater?
Higg - I think that’s called a “precommittment strategy”.