Lily Tomlin jokes that she doubts she'll live to see '9 to 5' sequel with Dolly Parton

Lily Tomlin isn't holding her breath for the "9 to 5" sequel.

The 79-year-old actress opened up about the long-rumored film during the "Grace and Frankie" panel at PaleyFest in Los Angeles on Saturday, teasing that while there's "hope" surrounding the project, these things take time.

"[We're] waiting for the script," Jane Fonda shared.

Jane Fonda Gives '9 to 5' Update

"Everybody is very hopeful. We may not live to see it," Tomlin cracked.

It's been nearly 40 years since the release of "9 to 5," starring Tomlin, Fonda and Dolly Parton, which quickly became a classic after it premiered in 1980. Though a sequel has been talked about for years, it's been difficult to line up all three actress' schedules -- Tomlin and Fonda revealed at Saturday's panel that they're having the same problem while trying to get Parton to guest star on "Grace and Frankie. "

Parton said that she, Tomlin and Fonda had all signed on for the "9 to 5" follow-up during an interview with ABC News' "Nightline" last year.

Dolly Parton Says Original '9 to 5' Cast Is Game for Sequel

"All these years we've talked about doing a sequel to '9 to 5,' but it never made any real sense," Parton shared. "Until just recently [with] all the equal work for equal pay and all the harassment in the workplace [backlash] -- we decided that we are going to try to do another one."

"We're trying to get the script and all that. Everybody is very interested, and we've all agreed that we'd love to do it, if it's right," she revealed.

While "9 to 5" -- and Parton's guest-starring role on "Grace and Frankie" -- is still up in the air, Tomlin and Fonda had no problem spilling details about the Netflix series' upcoming sixth season.

Emmys 2017: Dolly Parton Steals the Show with '9 to 5' Reunion with Lily Tomlin, Jane Fonda

The show will find Fonda's Grace and Tomlin's Frankie embarking on a new business venture. "And it has to do with the lower part of our bodies," Fonda teased.

As for Martin Sheen and Sam Waterston's characters, Sheen said of the pair's romance: "The overriding thing between our characters we really cannot talk about right now."