Bill Cosby could be ordered this week to essentially spend the rest of his life behind bars.

On Sunday, two women who say they were sexually assaulted by the once-beloved comedian said they think prison would be an appropriate sentence for the man once  known as "America's Dad."

"I think he needs to pay for what he's done to everyone," said Chelan Lasha, who testified at Cosby's criminal trial that he sexually assaulted her in 1986. "I have nightmares about it this very day and I want them to go away, just like him."

"He's committed a crime and everyone's responsible for their actions, and at some point he's got to take responsibility," said Lise-Lotte Lublin, who also testified at Cosby's trial, saying he drugged and assaulted her in 1989. "At some point he should acknowledge what he's done and do the time for the crime."

The two women spoke at a Center City news conference organized by their lawyer, Gloria Allred, the day before Cosby, 81, was scheduled to appear in a Montgomery County courtroom for his sentencing hearing. The appearance will be Cosby's first since he was convicted in April of three counts of aggravated indecent assault for drugging and sexually assaulting Andrea Constand at his Cheltenham home in 2004.

Judge Steven T. O'Neill will oversee the proceedings, which are expected to last two days, before imposing a sentence against Cosby. The maximum possible prison term for his crimes is three decades, though state guidelines suggest that any incarceration sentence could be far shorter.

Cosby's prosecution was the first celebrity conviction of the #MeToo era and capped a stunning downfall for the Philadelphia-born entertainer.

>> READ MORE: Was it #MeToo that convicted Bill Cosby?

Lasha, of California, and Lublin, of Nevada, were two of five women who testified at his trial in an effort by prosecutors to bolster the testimony of Constand, the trial's key witness and the sole accuser whose claims resulted in criminal charges. The statute of limitations in most other cases has long since expired, but Lasha and Lublin said Sunday that the pain from their encounters with Cosby remained.

"He ruined my life at 17 years old," said Lasha. "Took away my future … everything about me, and lived his life."

Cosby's sentencing hearing will likely feature argument from prosecutors and Cosby's lawyers, a victim impact statement from Constand, and possibly statements of support for Cosby from his relatives and friends. Cosby will also have the right to address O'Neill before the judge imposes a sentence, but he is not required to speak.

It remained unclear Sunday whether Lasha, Lublin, or other accusers who testified at trial would deliver victim impact statements in court. Both women said they hoped they would be able to take the stand and confront the man who allegedly assaulted them decades ago.

"I've dreamed of this for 32 years and I'm ready," said Lasha, who testified that Cosby drugged and sexually assaulted her in a Las Vegas hotel room when she was 17 and an aspiring model.

Cosby faces a maximum of 10 years in state prison for each of the three counts of which he was convicted, but Pennsylvania's sentencing guidelines call for 22 months to three years for aggravated indecent assault. O'Neill also could structure a sentence so that punishment for each count runs concurrently.

The Montgomery County District Attorney's Office is expected to ask O'Neill to impose a lengthy prison sentence, while Cosby's lawyers are expected to argue that he is in failing health and legally blind, and has complied with bail conditions since his 2015 arrest. Neither side has publicly filed a sentencing recommendation.

Cosby's conviction relates solely to his assault against Constand, a former Temple University employee who said Cosby invited her to his house, gave her three blue pills, and then assaulted her when she was unable to move. Dozens of other women have publicly accused Cosby of similar assaults, and Allred said it was "time for him to face the consequences of his criminal acts."

"Judgment day has finally arrived for this convicted sexual predator who betrayed the trust of so many women," she said.

At trial, Cosby's lawyers frequently cast Constand — who settled a civil lawsuit against him for $3.4 million — as fame-hungry and a "con artist." They sought to cast similar doubt on the other women who testified, and attempted to poke holes in their testimony.

Outside the courtroom, Cosby's defenders, including his wife, have also sought to paint him as the victim of a racist and corrupt criminal justice system, filing ethics complaints against O'Neill and comparing Cosby to civil rights icons, including Nelson Mandela.

Still, Lasha said she believed Cosby "deserved every single year" in prison allowed by law, and that women should not be afraid to report abuse or assault in the face of potential obstacles.

"I waited a long time," she said. "Keep your head up, pray to God, and follow it through."

Staff writer Jeremy Roebuck contributed to this article.