The hour hand is always the shortest hand on a clock.
When the hour hand points at the 12, at the very top of the circle, it is midday or midnight; when it points at 6, at the bottom, it is close to sunrise or sunset. It makes a full revolution in 12 hours (moving clockwise unless you have a Bavarian clock)].
I've always found it odd that the hour hand should be shorter than the minute hand, when the hour hand is more significant than the minute hand.