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

EU Election Observation Mission, Ghana General Elections, 2016, FINAL REPORT, accessed 27 September 2018

“The EC declared presidential election results on the late evening of 9 December shortly after President Mahama conceded defeat, with the opposition candidate Nana Akufo-Addo announced as winner of the presidential election.  […] The results of the parliamentary elections were declared by the returning officers at the constituency level.”

The results of the parliamentary elections were declared by the returning officers at the constituency level. Therefore, it is not possible to assess the timing of their publication.