If I were to vibrate runes, how many times should I do it without being suspicious?

Question #2222: Absolute minimum part 2
You can vibrate the runes, for example, in the bathroom or outside. That way you won't have to worry about someone hearing what you're doing.
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You can vibrate the runes, for example, in the bathroom or outside. That way you won't have to worry about someone hearing what you're doing.
