Pretoria - International ballot papers not in South Africa before 21:00 on Friday will not be counted, the Electoral Commission of SA (IEC) said.
"The commission made a decision to allow the counting of ballots received by 21:00 tomorrow from international voting stations," chief electoral officer Mosotho Moepya told reporters at the IEC's results centre in Pretoria on Thursday.
Should the ballots not reach the counting venue by the set time, they would not be considered.
"If they miss the deadline, they are sealed, stored away, and not considered in the elections."
International voting district results would thus only be finalised on Friday night.
Over 17 000 votes had been captured from 106 missions, with 10 missions still outstanding.