Scientific Speculation - Circular space station - what's the rotational speed to achieve earth-like gravity?

Imagine there is a space station shaped like a cylinder. The cylinder spins on its axis, in order to create artificial gravity through centripetal force.

My question: How fast would the space station need to spin to have the gravity be the same as on Earth?

I realize I probably can't get any exact speed without details on size and mass, so I'm looking more for a range (if it is possible to get an exact speed without knowing the details [like through a formula or something] that would be great too). The space station would be big. I'm thinking it would be made up out of 'wheels,' and then each wheel attaches on its axis to form the cylinder. Each wheel would be about the size of a small city. The space station would also have an extremely large population (think evacuation of Earth), so its mass would likely be gigantic. The space station is drifting - it is not orbiting anything.

I realize it isn't much to go on. Unfortunately, those are about all the details I have at the moment.

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Circular space station - what's the rotational speed to achieve earth-like gravity?

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