The speed at which the Sun appears to move across the sky depends on your location on Earth and the time of year. The Sun's apparent motion is primarily caused by the Earth's rotation on its axis. At the equator, the Earth completes one full rotation in approximately 24 hours, resulting in the Sun appearing to move at an average angular speed of 15 degrees per hour.
However, as you move away from the equator towards the poles, the apparent speed of the Sun across the sky decreases. Near the poles, during certain times of the year, the Sun may appear to move very slowly or not move at all due to the phenomenon of the midnight sun in polar regions.
It's worth noting that the apparent motion of the Sun is also affected by the Earth's orbital motion around the Sun, causing the Sun's position in the sky to change gradually over the course of the year. This is responsible for the changing seasons.
To summarize, the Sun appears to move at an average angular speed of 15 degrees per hour, but the specific speed can vary depending on your location on Earth and the time of year.