Except eight. You can’t do eight days a week, which is really a lost opportunity as far as I’m concerned.
If, however, you’d like a quick an easy way to get two, three, four, five, or six days in your Calendar “week” view, read on.
You’ll need to launch Calendar, and then hit Command-1 on your keyboard to place Calendar into Day view, first though. Trust me.
Once you’re in the Day view (you can also just click on the Day button at the top of the Calendar window), then you can hit Command-Option-2 to show two days at once.
If you’d like to show three days, hit Command-1 again to get back to the Day view, and then hit Command-Option-3.
Go back to the Day view again, and then press Command-Option-4 for a full four days in your week view.
You can continue to do this all the way up to seven days, hitting Command-Option-7. Like I said, eight is not an option. See what I did there?
Now you should be set for all sorts of odd day views, provided you don’t want something like 50 days in your week, you odd duck, you.
Via: Mac OS X Tips