DrJynx86answered grow question 4 years ago As long as you don't cross contaminate and keep everything clean, it should last as advertised.
The only thing you need to take care is to never let anything to get into the container, not even "unused" product after mixing, if you have any leftovers it's better to trow it than to try to recover it.
Pretty sure it's not required to be refrigerated, but that's an extra step to be sure temperature and darkness is optimal.
Keep on the great care!
Happy smokes!