A single activity is the time spent by one person doing a single activity on a single job on a single date. Single activity entries are especially useful when you want to enter the details of a job as soon as you've done work on it. For example, a lawyer might make a single activity entry to record a billable phone conversation.
To enter several dates or several jobs at once, use the weekly timesheet form instead.
Note: If you'd like to use the free QuickBooks-integrated application My Time, turn on time tracking (QuickBooks > Preferences >Time Tracking) and then download your copy of My Time.