At some point in time I changed the default duration time of new iCal events to two hours vs the standard (60 minutes). I have been booking more frequent and shorter meetings lately so I wanted to change my default event times to 15 minutes. Since I couldn’t remember how I did this some time ago I had to find the reference which is have provided below just in case you find it useful also.
Change the Default Length of New iCal Events (Example 15 Minutes)
1. Quit iCal
2. Open Terminal (Applications/Utilities)
3. Enter the following and press return:
defaults write com.apple.iCal 'Default duration in minutes for new event' 154. Type Exit to Quit Terminal
Simply replace the 15 with any number of minutes you wish to set your default duration time.
Change the Default Length of New iCal Events Back to Default
1. Quit iCal
2. Open Terminal (Applications/Utilities)
3. Enter the following and press return:
defaults delete com.apple.iCal 'Default duration in minutes for new event'4. Type Exit to Quit Terminal
Now get back to work!