Calendar Timesheet
Drop your calendar export and get the hours already summed by category.
Accepts .ics calendar files.
Google Calendar: Settings → Import & export → Export downloads a .zip — unzip it, then drop the .ics file inside. Outlook and Apple Calendar export an .ics file directly.
Category totals first, then every event.
Sample
Invented events, run through the real calculation. Change the rules or the options and the numbers respond exactly as they would with your own calendar. Drop a calendar file above to replace it with your own.