Are we sure its not between 8:00 AM and 6:00 PM and working hours? Or are is it supposed to signify guarding overnight time? ~ Yami Michael 08:55, January 23, 2016 (UTC)

The 6:00 PM part is placed first, then then 8:00 AM part. It does look like it's guarding against overnight intruders. BlitzerRyuusei (talk) 08:56, January 23, 2016 (UTC)

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