I'm guessing 600-800 feet.
You mean you can't run to the top of Everest in 2.5 minutes????
Everest doesn't have finely-chiseled steps for people to climb upon...
Anyway, I estimate the TotW to be, taking into account the 7000 steps being approx. 5 inches tall, with around 100 or so leading downward and around 500 feet of no-stairs slope: roughly 3000-3500 feet tall. Give or take a few hundred.
This is taken to scale the down-sized scale of Skyrim. If it (Skyrim the game) was in the same style as Daggerfall with 2 weeks required to cross the map, I'd imagine it would be 20,000+ feet tall (~6500 meters)