Steve wrote:

The task dialog does not allow for times, only dates.

Oops. Yes, I knew this. Tasks themselves are date oriented, not time
oriented, but you can put a time on the reminder.

The reminder dialog does not have an option to mark the task
completed, only to dismiss it or snooze. Does this mean I'd have to go
back to the original task each time and mark it completed?

Right-click the task in the reminder box and choose "Mark Complete".
--
Brian Tillman [MVP-Outlook]