This means that you should have enough time to fill it out properly in order not to leave blank sections. (singlesdatematch.com)
One variation I have used in the past is to put five blank sections on the reverse side of the page. (edutopia.org)
1995: The Hubble Deep Field After pointing Hubble at a supposedly blank section of sky for more than 100 hours, astronomers discovered thousands of tiny, distant galaxies. (discovermagazine.com)