The current Travel Time workflow creates separate calendar events for travelling back and forth. The Travel-Event has the same visual appearance / priority as the main event. This clutters the calendar and makes it harder to navigate or get a visual overview, especially when sharing the calendar or using external calendar apps, where the traveltime is not needed.

Instead, I suggest to integrate travel time directly into the event they are traveling to, obviously only if this is an event with a location. This would also allow to flexible time traveling calculation, using the users current location and favorite transportation method. The visualisation could show the Travel-Time needed in a concise/cleaner way.

If this is too big of a change, I suggest updating traveltime continously first. And allowing to automatically calculate the traveltime for the next day as an option. This way the "travel-time-pollution" weeks and months ahead, where it does not matter yet, would not happen.