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At the top right of your Google Calendar screen, click the Settings icon and select Settings

On the top left, under General, click on Working hours & location

In the Working Hours section, click on Enable Working Hours

Select the days you work, then the times you work

You can split the hours that you work if they’re not always contiguous. Click the “+” button next to the day to add additional times

If your times and locations are always consistent, you can enter the information on the first day and then click copy to all to apply this to all days listed
