I went into Elgrims Elixirs at 7 PM to deliver an ore sample and sell some stuff. I was worried that I might not have enough time to get to the market and unload my other stuff before all the shops shut down. But when I came out of the shop it was now 7 AM. Twelve hours just dissapeared!

Bethesda sneaked in a new shout that automatically happens when you complete a quest.
Its called, Fast time.