I know that time elapses during Fast Travel, and I believe it is generally proportional to the distance being traveled. I'm also aware that time is relatively irrelevant in Skyrim - none of the quests are time-sensitive, but certain things (such as shops) may only be available at certain times of day.
So, I'm curious to know if there's any way to tell in advance how much time will pass during my Fast Travel? It would also be interesting to see if the travel time ends up being measured in days, instead of just hours.