I've never seen this question asked or addressed on the forum, but I would answer it the following way. Of course it's just an opinion, but informed.
From the anecdotal accounts, if one takes the proper amount of SN (20-25g) with the proper amount of water (50ml), the attempts were successful unless there was intervention.
Many folks prepared two extra glasses in case of vomiting, but no one ever reported drinking them, even if they vomited, and they still succeeded.
There is the possibility that taking too much SN causes vomiting to happen way more rapidly than if the appropriate amount is taken, and so causes failure. There's only been one report of this that I personally know of, and as I recall, there wasn't enough clarification by the member to be certain of what exactly happened.
I would think that if you followed the protocol correctly as above and there was no intervention, then there is no chance that you would lose consciousness and later wake up. The method should cause death in four hours or less. I can't say confidently what would happen if you were to wake up hours later and immediately try again. Perhaps it would be better to take time to recover since too much SN could lead to rejection of the toxin and therefore survival. That's the best I can come up with. Perhaps other members with a scientific background, or who have done deeper research into the method, can give a more informed answer.
