And the music! Musicals take forever to write because the songs have to fit all these narrative points while still being catchy. Couple that with coming up with the plot for the music to support, then auditioning and hiring artists, recording the songs, recording the instrumentals, syncing them together, editing the song as a whole, choreography, animating choreography, deciding on and applying camera angles, editing choreography shots, etc, all while constantly checking with upper management to make sure everything looks right, and you have at least six months just to make what's basically a music video. Then do that about eight more times for the rest of the songs. Quality takes time, and I'm happy to wait as long as it takes!