It's not about "hours" on Uranus, but about how long a Uranian day is.

Here's the breakdown:

* Uranus rotates very slowly. It takes 17 hours and 14 minutes for Uranus to complete one rotation on its axis. This is its "day".

* However, Uranus' axis is tilted at an extreme angle (nearly 98 degrees). This means that its poles are facing the sun for a very long time, resulting in a very long "day" at the poles.

So, while a single rotation takes about 17.5 hours, the actual length of a day on Uranus depends on where you are on the planet.