Disc Rotated Flatly?

A flat disc on the top of a rough, horizontal table with coefficient of friction $$\mu$$ is being rotated with angular velocity $$\omega_{o}.$$

How long will the disc rotate (in seconds) before coming to rest?

First, generalize, and then plug in the following values for the answer: $\omega_{o}=10 \text{ radian/s},\ \ R=4\text{ m},\ \ \mu =0.3,\ \ g=10\text{ m/s}^2,\ \ M=4\text{ kg}.$

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