You can set multiple countdown timers with labels to keep track:
In the Clock app , tap for the Timers tab.
Enter the time to count down.
Tap .
Do any of the following:
To pause the countdown, tap .
To add a minute to the countdown, tap + 1:00.
To reset the counter to the original time, tap .
To add a timer, tap .
To delete a timer, tap .
To change the timer's sound, tap > Settings > Timer sound.
If you leave this app, quickly return to it by swiping the status bar down with one finger to see the timer notification and remaining time. To open the timer, tap the notification.
Use a stopwatch
Record your time.
In the Clock app , tap for the Stopwatch tab.
Tap Start.
Do any of the following:
To record laps (or multiple durations) while the stopwatch is running, tap Lap.
If you leave this app, quickly return to it by swiping the status bar down with one finger and tapping a control. To open the stopwatch, tap the notification.