How does Calendar calculate travel times?

When I select the Travel Time function for an event in Calendar, it tells me there is a 35 minute travel time from home to my scheduled event destination. However, when I transfer over to the Maps application to get the directions from my home, the Maps application tells me the travel time is 52 minutes, which is more accurate.  I have no previous events on my calendar that the application could use as a reference point, and the time of the event is outside of the working hours I setup in Calendar, so it is not using my work location as a reference point.  What can explain the travel time discrepancy between Calendar and Maps?

If I understand the feature correctly, this is not an Exchange supported function.  Therefore, you won't be able to use this option for Exchange.  iCloud Cal supports it.  Interestingly, i too have both calendars and use exchange almost entirely as well - when I change to entering an exchange appt, the travel time option disappears totally.  It sounds like you have the options still available. 
Sorry, no answer to your problem here but maybe this adds another piece of the puzzle.

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