Currently, the calendar events in the month view don't show the end time of an event, and in the week view neither the start time nor the end time is shown. This means that to see the complete time information about an event you need to hover over it with a mouse. This behavior is undesirable, because hovering takes time and happens with a delay.
I think that the ideal solution would be to show the time on the event container. For the week view the solution seems obvious, just show both the start time and the end time on the second line of the event, like in Google Calendar. For the month view, since all events use only one line, it might be up to the user to decide whether they want to use the space for displaying the end time or not.