One's attention span was the length of time one was able to focus on a task or subject.

In 2371, after being duped by Seska, Chakotay questioned whether, among other things, paying too little attention might have been to blame for his lapse in judgment. Tuvok assured Chakotay that he had always found the first officer's attention span to be quite adequate. (VOY: "State of Flux")

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