Probably depends on what's in it, ie a single
pheromone like androstenone (maybe with a bit of secret ingredient in there as well) vs a "all in one" like Chikara.
I've had some of my single (or limited) ingredient pheromone products like NPA for a number of years because I use
them so infrequently. Chikara, and even SoE, does indeed go faster, but I don't use everyday and rotate beween a
number of different products a bottle of Chikara can last me 6 months or more. IMO I think it's best if you use
pheromone products sparingly, and not on an everyday basis to keep them "fresh" to your targets.
Oil-based
"dropper" products (like A7) seem to last longer in terms of number of applications than spray type in general as
well, at least for me.
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