Or, y'know, cast Consult Oracle and ask "What is the chief bad guy's super secret plan?" You'll get the overview in a brief phrase, and still have a question or two left to fill in important details.You collar a henchman and discover that the bad guys(tm) are having a top secret meeting in a top secret location in one hours time, where the chief bad guy will explain his super secret plan to his inner circle in a presentation that lasts for a little under an hour. And no, henchmen are not invited or even told the location of the top secret meeting.
Guess you'd better be lucky with that 30 second scry!
Note that Consult Oracle will function, as at least one creature knows the chief bad guy's super secret plan, and cannot be blocked by scry protection measures. This is not a situation for a scry of any length.(Edit: I realized after submitting that I overstated the last sentence. An hour-long scry will get the job done, but is not the only, or even necessarily the best, way to get the desired results.)
Of course, you could also scry on the meeting and gain the ability to identify the chief bad guy and his entire inner circle on sight, assuming that you don't already know all of them.
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