When creating new calendar events in the Calendar application the duration of the event defaults to 60 min. In earlier version of macOS it apparently was possible to change this by running
defaults write com.apple.iCal 'Default duration in minutes for new event' 120
but it doesn't seem to work anymore with Mojave (it does set the new value but Calender still creates events with 60 minutes after restarting). So how can I change the default duration for new events in Mojave?