I have a fascination with "time". At times, when things are going slow, tedious, you are impatient, or perhaps things are just dull, time can feel like it's going soooo slow. 30 minutes can feel like an eternity! But when you are having fun, are otherwise intently focused and occupied, or are naturally patient, time may feel like it zips on by! A full hour can feel like only ten minutes!
Another perspective is the clocks that show us what time of the day it is. The old-fashioned analogue clocks are the most interesting, I think, with their intricate gears, fancy roman numerals and ornate hands. Clocks and time and keep great secrets, and example would be from the game (and book) Secret of the Old Clock.
Another great puzzle example of how clocks keep secrets, would be in Ghost of Thornton Hall. This image from our merchandise store quotes Nancy when she first tries playing with the clocks on the mantle.
Secret of the Old Clock, but my mind has been on another clock...
As for the weekend puzzle, simply translate the dots and dashes as Morse Code. (The slashes are only to break up the code letters). You would get this answer: [Eye spy a ghost]. A reference to Ghost of Thornton Hall.