if you make it big enough the outer edge can be made to go as fast as you like--in theory.

In reality, if something gets moving fast enough, it gets more massive, making it require more energy than you'd expect to make it speed up, due to relativistic reasons. A rotating object spinning at relativistic speeds could not remain rigid,

But gas clouds funneling into black holes have been clocked at enormous velocities.

The earth is 8000 miles in diameter, and rotates in 24 hours.

The sun is 800,000 miles in diameter and rotates in 25 days.

The earth is 193 million miles from the sun and revolves around it in a year.

The sun is 30,000 light years from the galactic nucleus and revolves around it once in 250 million years.