In theory, the time they're designed to take is usually around 5 seconds, yeah. What you see there is an engineering safety factor, to make sure the advice works even if it's off-spec and Lucy's counting is too fast. :)
And mine always seem to take a little bit longer than 5 seconds, too.
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timeasmymeasure
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And mine always seem to take a little bit longer than 5 seconds, too.