The court granted his appeal at the end of 2014 but this year a jury rejected Lyttelton's defence of mental illness combined with his excessive drug consumption.
In the High Court at Auckland last week, Justice Raynor Asher sentenced him to seven years in prison but, because of the time spent behind bars, it was thought Lyttelton may be there for a matter of days.
The Parole Board confirmed today though that it will only be July when he next has a chance of early release.
At the most, he will be imprisoned for 13 months.
The court heard how Lyttelton and Mr Ord were business partners for some years before their relationship began to sour in 2000.
By 2008, the defendant had become depressed and consumed by the dispute, Justice Asher said.
Lyttelton turned up at the victims' property with a loaded .410 shotgun, spare shells and a skinning knife.
He shot Ms Fenton in the leg before Mr Ord confronted him.
A skirmish saw the shotgun discharged into a wall and the pair struggled downstairs and into the garage where Lyttelton unsheathed the knife and continued the attack on the man.
"You were attempting to kill him in any way you could through that struggle," the judge said.
The jury rejected the defence that his judgment was "completely clouded" by his mental illness and the residual effects of the drugs.
The court heard the victims lives had been forever altered by the incident, especially that of Ms Fenton after sustaining a "very large hole" in her left thigh.
"There are still pellets in her body that can't be removed and clips to clamp off veins where the artery was shot away," Justice Asher said.
She would be permanently weakened, he said.
