To achieve the film's detailed full animation while keeping to the tight budget, the studio strove to keep any waste of time and resources to a minimum. The crew often worked long hours with no immediate financial reward (though they were offered a cut of the film's profits, a practice common for producers, directors and stars of live action films, but never before offered to artists on an animated feature); producer Gary Goldman recalled working 110-hour weeks during the final six months of production. Around 100 in-house staff worked on the film, with the labor-intensive cel painting farmed out to 45 people working from home. Many minor roles, including incidental and crowd voice work, were filled in by the in-house staff. The final cost of the film was $6.385 million. The producers, Bluth, Goldman and Pomeroy and the executive producers at Aurora mortgaged their homes collectively for $700,000 to complete the film, with the understanding that their investment would be the first to be repaid. The film was the sixth animated feature to be presented in the Dolby Stereo sound system.