Anytime
. After having my fair share of successes and failures, I've found that spirits like having a lot of information. Its something akin to talking to a friend and telling him to go find your friend John. There are a lot of people out there named Jack, so your friend wouldn't be able to find John with any real ease or accuracy. Now, if you were to tell your friend to go find John McAlister in Phoenix, AZ, at such-and-such address and gave him a photo, your friend would have a much easier time tracking John down.
Our visualizations and the like are basically like filters in a database. The more specific we are, the more likely the entity we are working with is going to be able to find the target.