I am in the trial and error phase of steeping/aging as well...right now I have 8 or 9 bottles that have sat in the closet since Sunday. If I am planning on letting them stay there for a week, do I need to remove the caps for the entire time or a few hours before I vape them?
Actually you should ask the vendor their preferred method of steeping, or even if they need steeping. Suppliers forum: E Cigarette Suppliers Forum
Browse those threads and ask over there. Someone should be able to let you know what the preferred method is. General steep method is cap and dripper off 24 - 48 hours. Cap back on and shake whenever you think about it for a week or two. The more complex or fresh the liquid, the more time it needs. The less complex, less time it needs. Smaller bottles steep faster than larger bottles. Plastic bottles steep faster than glass ones.
edit to add: shake your juice before putting it into whatever you are using to vape with. Every time.