Honestly, if it takes longer than 10mins to CBT, the wearer would think that it is not working or malfunctioning.
That's a new disadvantage I hadn't considered: It's true if it takes too long... that could invoke anxiety (i.e., When is it ever gonna happen?).
To be effective, CBT ought to occur within a minute's time.
As you know
@LetzteAusfahrt was well practiced with inert gas techniques... And yet, he made a convincing argument that he ~wanted to experience a period of time "dying
and knowing he was dying"*...
I can see some value in what he did: It'd be nice to have a few minutes (after starting the procedure) to "settle down", try to "drop all the baggage" from this life, and go-out with a completely "clear mind".
Does that make sense...?
Unfortunately, with inert gas done correctly, there is little time to consciously accept it and "relax into death".
* So he chose SN, which generally takes much longer than a minute.