Editing video clips, creating long documents, enjoying games, watching movies, etc, are sometimes part of our daily workflows, workflow tending to "use" numerous hours, sometimes more than we previously anticipated.
Usually, a remedy is the usage of an alarm that, set as one's initially scheduled activity, stops the in-progress activity after x hours/minutes.
Cuckoo is a simplistic yet effective alarm utility, aimed at setting and generating alarms in a matter of seconds.