A woman who stabbed her two teenage daughters to death as they slept must stay in jail until at least 2040, a judge has ruled.
Mr Justice Bean told Cambridge Crown Court 41-year-old Rekha Kumari-Baker would be 72 before she could be considered for parole.
The judge imposed a minimum 33-year prison term after Kumari-Baker's ex-husband, David Baker, told of his "incalculable" suffering.
He said waitress Kumari-Baker had already spent two years and 92 days in custody and therefore had at least 30 years and 276 days left of her sentence.
A jury of seven women and five men on Monday found Kumari-Baker guilty of murder following a two-week trial.
Prosecutors said Kumari-Baker, of Stretham, Cambridgeshire, killed Davina Baker, 16, and Jasmine Baker, 14, to "wreak havoc" on Mr Baker. The jury heard Kumari-Baker attacked the girls at her home in June 2007 - stabbing Davina 37 times and Jasmine 29.
Kumari-Baker mounted a diminished responsibility defence - with lawyers arguing she was suffering from an "abnormality" of mind which made her guilty of manslaughter not murder. But jurors took just 35 minutes to conclude she was not mentally ill and find her guilty of murder.
Mr Justice Bean imposed two mandatory life terms - and set a minimum term - after telling the court that her defence was "flimsy and insubstantial". The judge said he thought her motive was a combination of mild depression and a wish to retaliate against her ex-husband.
"You knew quite well what you were doing and you were not mentally ill," he said. "The crimes were, as the prosecution rightly put it, murder, full stop. Davina and Jasmine were cruelly cut down in the prime of life. Their death has been a shattering loss to their father and friends."
Prosecutor John Farmer read extracts from Mr Baker's victim impact statement to the court. "My words may not be sufficient," Mr Baker, a businessman, said in the statement. "Having them taken away from me in such a brutal way and by the woman who was their mother ... has had an incalculable effect."
