When the calendar is in edit mode, there is an "Edit Display Options" link at the top of the page under Calendar Administration.
  
If you click the link, one of the options listed is Show event end times on "This Month's Calendar." The default value for that option is no, so, by default, end times will not be shown on the calendar. However, if you would like the end times to display on all of the events in your calendar where end times have been specified, change the option to yes.
  
This change will also be reflected when you print your calendar. If the end times are displayed on your online calendar, they will also be displayed when you print the calendar. If you do not want the end times to show on a printed copy of your calendar, you can temporarily change the end time option to no.  When you are finished printing your calendar, change the end time option back to yes so that the end times will remain on your online calendar.