In the last national election, how many days did it take for the EMB to announce certified results?

Japanese Election Results 2014

Japanesevoters effectively put their stamp of approval on so-called Abenomics Sunday,propelling Prime Minister Shinzo Abe’s Liberal Democratic Party to a rout insnap parliamentary elections. The LDP and its junior partner, the Komeitoparty, were assured more than the 317 seats in the 475-member lower houserequired to maintain a two-thirds supermajority there, according to Reuters, which cited the country’s publicbroadcaster NHK.

Source:http://www.ibtimes.com/japanese-election-results-2014-officially-huge-win-shinzo-abes-liberal-democratic-1755570