Simple. Press play and a Timer App session will begin. When you’re done, press stop and the Timer App will show you how many hours you worked. You can use the name and hourly rate to get accurate information about each session. Here are a few more tips: You can pause one session and start another one by pressing the “New Timer” button. When you do this, you’ll see multiple lines on the screen, one for each session. Switch between sessions by pausing one and starting another. This is very useful when you work for multiple clients during the same day. When you are finished, click “Download CSV” to receive a spreadsheet of your hours worked. The Timer App will automatically calculate the amount billed by multiplying the hours worked in each session by the hourly rate you supplied.