Speedboat killer Jack Shepherd has had his sentence reduced by almost three months by appeal judges.
The 31-year-old is serving a six-year sentence after Charlotte Brown was fatally thrown from his boat on the River Thames in December 2015.
Shepherd fled the country ahead of his trial at the Old Bailey and was later extradited back to the UK.
The Court of Appeal ruled the 78 days he spent in custody in Georgia should count as time served.
Shepherd did not attend the hearing earlier, where Lord Justice Fulford, Mr Justice Holgate and Sir Roderick Evans made their decision.
The prosecution did not raise any objections.
Shepherd was convicted in his absence in July 2018 of manslaughter by gross negligence.
He handed himself in at the Georgian capital of Tbilisi in January 2019 and was brought back to the UK.
The trial was told Shepherd and 24-year-old Ms Brown, from Clacton-on-Sea, Essex, had been out drinking and went on a late-night boat trip on the Thames.
He handed the controls of his boat to Ms Brown moments before the vessel struck a submerged tree and overturned, jurors were told.
Shepherd was plucked from the water alive, but Ms Brown was found unconscious and unresponsive.
After his extradition, Shepherd was also sentenced to a further six months in jail for breaching bail.
In addition, he is serving a consecutive four-year sentence for wounding with intent in relation to a drink-fuelled attack on a barman in 2018.