It was not immediately clear when Judge Ben Hlatshwayo would make his ruling in the case brought by the Movement for Democratic Change (MDC), but legal sources said it could take weeks and even months.
The judge said he needed "time to digest" the "complicated submissions" and come to a conclusion in the matter.
Opposition lawyers, who had been making submissions since Monday, wound up their arguments yesterday.
Mugabe's defense attorney, Terrence Hussein, then took about an hour to make his response to the petition by MDC leader Morgan Tsvangirai, who lost to Mugabe in last year's vote.
The hearing comes against a background of political and social strife and economic crisis in the southern African nation ruled by Mugabe since he helped oust the white minority government more than two decades ago.
Tsvangirai, who has posed the greatest challenge yet to Mugabe's 23-year grip on power, wants a rerun of the March 2002 poll, which was largely condemned by Western observer groups who backed his charges that it was marred by violence and vote-rigging.
But some African observer groups declared that the election had been free and fair.
Mugabe, 79, clinched a fifth consecutive term in office when it was declared he got 56,2% of the votes, against 41,9% for his opponent. – Sapa-AFP.
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