How often do you have something scheduled at 3am? What about 10pm? If the answer is almost never, you might want to try out the Hide morning and night lab in Google Calendar.
With a simple drag of a slider you can fold all those empty hours into a single row to set the time range you want to hide. The folded rows still show all your events, just in more compact form.
We're launching this in Calendar Labs (Settings > Labs) to gather feedback on how people end up using this feature. So don’t forget to tell us what you think about this latest addition.