Posts like these scare me, where they survived with 5 hours and with a lot of damage: https://sanctioned-suicide.net/threads/i-survived-taking-n.47461/#post-856961
They had a very different administration of n than you (powder not liquid) and admits that they're not sure of the dose because some fell off the spoon??
I mean, there's no way of knowing: for all we know, everyone who said they were taking there's just logged off forever- but im pretty sure at least one person would have come back to warn people of their failure. I've seen at least 6-8 people make N CTB posts since late 2020, they never came back.
Additionally, someone had live-streamed their bus ride with a partner and the person who wrote up the report said both went pretty quick and fairly easy- both guys were heavier, older and it apparently was fine.
This is all anecdotal but I feel pretty confident that it works- what I'm not sure if is the time span. Supposedly The live streamers appeared to pass but who knows how long it actually took. I'm not sure how this will factor into your timeline. I hope if you're not sure that you are able to wait- We will all be here for you either way.