You can set a timer to repeat using the "Repeats" setting. It will automatically loop as many times as you'd like!
When creating a timer or editing a timer, under the Timer Duration, you will see the “Repeat” setting. Select the – and + buttons to edit the number of repeats you want.
When a Timer has been saved and is active, at the bottom of the screen you will see the Repeats icon. The repeat Icon will show how many repeats are completed out of the total number.