I just got my first shipment of Instant Honesty, Instant Sexiness A, Instant Shine. I sprayed 1 on my hair 1 each side of neck. I read that the effects can start instantly to 5-10 minutes once you put it on. Question! Important to me!!! How long does it last once you spray it on until you have to spray again 
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P.S. I felt a funny feeling like a bubble of air around my head with the scent in it, felt great!. Smells really good and makes me feel in a good mood right now 
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That depends on what type of phero it is…the spray ones tend to last for about 4-6 hours before you need to top-up…
The oil based ones last longer but diffuse slower so the reactions aren’t as obvious, they take a bit longer
It also depends on where you live, somewhere like Singapore you might only get 4 hours from an oil based mix.
IS is reckoned to be the shortest lived, sometimes as little as 2-3 hours before the effects become less noticeable. Like so many things with these little bottles, your own tests will tell you far better than we can.
Most pheromones in most climates will last 4-6 hours. Please consider that even though you might not be able to smell the carrier scent any longer the mones are still active. It is also important to remember that the longer the mones are on you the results will still be there but may diminish in the strength of reactions you are getting.
Ishine consists of TAA which is one of those tricky little molecules that like to fade away quicker than the rest. Now it’s not that it doesn’t last 4-6 hours like the rest of them, it does, its just that the happiness associated with it diminish quicker. Ishine is designed to make the wearer and those around them happier and more confident, so while the happy vibe seems to go faster the confident vibe does still stick around.
When it’s super hot outside and you are sweating as with any cologne, the scent will fade faster. It’s always a good idea to have a to go bottle of your fav on you just in case. Good question