A lot of time tracking software tools have a feature for inactivity or idle time to automatically stop the timer if there is no keyboard/mouse activity. Then typically a popup appears and asks if they are still working on the task with options to dismiss the notification and continue to track time or discard the time that was inactive.

This would be awesome to see as a feature in Clickup's time tracking and would greatly improve the accuracy to which time is being allocated to tasks. It's not always easy to remember to stop timers.