There is a centrifugal force calculator where you can play around with the fields and get some possible values for a centrifugal acceleration of 1g.

https://www.omnicalculator.com/physics/centrifugal-force

(Mass field can be any value and won't affect acceleration or velocity fields)

Centrifugal acceleration: 1g

Tangential velocity: 100,000 mph

Radius: 126,626 miles

Centrifugal acceleration: 1g

Tangential velocity: 250,000 mph

Radius: 791,413 miles ..................

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That calculator is a good find! I ran your figures through it myself to see how long each rotation would take:–

Tangential velocity (Tv) 100,000mph Revolutions per year (Rpy) 1101 which is about 3 a day!

Tv 250,000mph Rpy 440.45

Tv 500,000mph Rpy 220.2

Tv 1,000,000mph Rpy 110.1

Tv 2,000,000mph Rpy 55 (6.64 days per revolution)

Tv 20,000,000mph Rpy 5.5 (66.4 days per revolution)

Tv 200,000,000mph Rpy 0.55 (1.88 years per revolution)

I think 1.88 years per revolution is still a bit quick to not notice. However, the last calculation is:–

Tv 671,000,000mph which gives 0.164 revolutions per year, or about 6 years per revolution

– but this is an upper limit to the period of revolution, because it's a fraction short of the speed of light in a vacuum.

I hope I haven't made any glaring arithmetical error here...