From a good piece in this month’s Vanity Fair, “Coloring the Kingdom”, about the often-unsung Ink and Paint “girls” that cranked out most of the hand painting for Disney’s early feature days:
The end of the assembly line usually inherits all the problems.  Preparing the animators’ vision for camera required the inking and  painting of thousands of fragile, combustible cels with perfect  refinement. During Snow White, it was not at all unusual to see  the “girls”—as Walt paternalistically referred to them—thin and  exhausted, collapsed on the lawn, in the ladies’ lounge, or even under  their desks. “I’ll be so thankful when Snow White is finished and  I can live like a human once again,” Rae wrote after she recorded 85  hours in a week. “We would work like little slaves and everybody would  go to sleep wherever they were,” said inker Jeanne Lee Keil, one of two  left-handers in the department who had to learn everything backward. “I  saw the moon rise, sun rise, moon rise, sun rise.” Painter Grace Godino,  who would go on to become Rita Hayworth’s studio double, also  remembered the long days merging into nights: “When I’d take my clothes  off, I’d be in the closet, and I couldn’t figure it out: am I going to  sleep or am I getting up?”
(Via Mayerson on Animation. Photo © Walt Disney Productions/Photofest.)