Yeah, I know, iCal isn’t for time tracking. But I can’t help it, sometimes it’s just what I need. But iCal can’t sum up the time for several events. There is the iCal Duration script, but unfortunately it breaks for me after upgrade to Os X 10.8.
So I had to do my own app, no other options, really
It’s not an Apple script, because I can’t write a hello world there, and didn’t feel like Googling… So I made a JS one-page app for the browsers. Check it out here: icalligator.changeset.hr