I think it would need a lot more than a few hours.

And you need a mechanism to cause it.

And then a mechanism to spin it up again.

Earth's mass is 5.9742 X 10 superscript 24 kg, so it would need a force of 5.9742 X 10 superscript 24 newtons to accelerate it through 1 meter per second squared. Unfortunately, my physics studies have not extended to rotational forces, but even so, I can see that to end the current speed at the equator of 1670 kilometers/hour requires a huge force, from something equivalent to the size of the Earth itself.

Have you ever grabbed a toy gyroscope and tried to stop it?

Scale that up.

Penny