Help Once mixed in water, how long does it take for SN to start loosing it's efficiency?

[UmbraDweller]

Lately I'm considering SN as my method. So far I'm just picturing the process in my head:
I prepare the drinks at my home inside of PET water bottles so I don't have to take any extra stuff with me + to be calmer that everything is ready. Then I take a walk to my spot, might be over two hours long. I sit there up to another hour to chill and get ready mentally, maybe send some goodbyes etc. as well.
I was wondering if the drinks become less effective in such period of time. How long does it actually take for the drinks to start loosing on it's effect? Should I rather mix it at the spot right before drinking or it doesn't matter?

 

[situationalsui]

I have wondered about this as well. Wish I had an answer for you.

 

[Tesha]

It's actually a fairly stable inorganic salt; despite the comments that once opened oxidation will occur. It will easily last several days, if not weeks in solution.

 

[sanitystruggle]

A few hours in a water bottle definitely won't matter: concentrated solutions of SN are very stable since they inhibit the growth of bacteria that could otherwise oxidise the nitrite into nitrate: levels above 2.5-4% by weight inhibit microbial growth so 25g/50ml (50% w/w) should have a very long shelf life in a sealed container.