I find that if I only do an hour of work in a day, I get ten minutes of work done. If I do 12 hours of work, I seem to get 24 hours of work done.
Andrew Hussie on his insane Homestuck workload.
This is especially true of animation. Such projects notoriously take a very long time. I feel like because of the crazy head of steam I've built up from years of nonstop effort, I can knock out in days something that might take another animator a week. Or in a week what might take a month. Without that momentum, it's not possible. Starting up Flash cold is excruciating. Getting your head back into the stride of a story wastes energy you wouldn't use if you never broke stride. Without the momentum, the pace reverts to ordinary. Getting distracted by life destroys the momentum.