My opinion: as long as they are
fairly well re-sealed and haven't gotten dried out I'd think they'd be good for at least a week or so. I've used
some as much as 2 weeks after I first opened them.
The catch is, I can't tell if the overall effectiveness
diminished any or not, as I have yet to find a product that gives me overwhelming obvious and consistant results
where I would have some basis for a comparison test between "fresh opened" and "aged" product.
In any case the
stuff shouldn't "go bad" to the point of it giving really negative results (unless it's a high androstenone
product and you encounter someone who is real sensitive to it, which would probably happen if fresh or old). So I'd
say go ahead and give it a try and see what happens. Maybe you'll discover thestuff works better for you...
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