[swah]

So you create an event "calling tom" from 09:00 to 09:30, then call tom? Then check how long that took, and adjust on calendar?

[afarrell]

Yea, though I'm not strict about it. If the call was from 9:05 to 9:40, I leave the event alone.

Note that I've not tried doing this for a day when I've got a bunch of little tasks to push through.