To start the timer click the clock icon at the bottom left of your screen:

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Then click Add Time recording, enter the details and click Add Time Recording:

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Enter your Time Log Details and click Add:

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Then click the Play button to start the timer and pause to pause it:

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You can then click the X to close this popup:

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An the timer will continue to count for you:

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When you're done just click the Time Log to open the pop up again and click Save:

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You can then edit the Time Log. If the Time Log is chargeable then you can enter the hourly rate for this work: