Normally with AiV, vaping right out of the box is fine (which is good, because most of us just can't resist popping open the bottles... mmmm... ) -- just like any other juices, their citruses do seem to get better with time (and apparently, bandersnatch). Ravyn being a tobacco though, I don't know. The only other tobacco of theirs I've heard of is pearship, and I have heard giving it a week to steep helps. Guess its gonna be one of those.. do what feels right situations.
(Or do what I always do... taste, and steep the rest... and by steep i mean... leave the bottle open, until its time for a refill...)