As said, fruit flavours are basically good to go as soon as you've mixed them up but anything that is lets say dairy type ie: custards, creams then they benefit from a good steep for anywhere from 3+ weeks usually around the 5 weeks mark, and forget all this leave cap off for few days etc thats floats around on net as that bollox! All you have to do is if your steeping a juice just give the bottle a little shake every day.
Plus what ever you mix up write it down what you used and % of each flavour as you just might come across a mix that you really like and is an ADV for you
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