A Google Places Help thread from the past has gotten some recent attention.
Business owners who are open 24-7 feel they have no clear and easy way of communicating that to their customers on Google Maps via Google Places.
Google offers businesses to label their "hours of operations" but there is no check box for 24 hours.
Google Maps representative, Cecelia said you should try setting the hours of operation to "1:00:00:24:00,2:00:00:24:00". But many businesses are not happy with that option.
Do you think Google Maps should add a 24 hours option?
Forum discussion at Google Places Help.