Colour Process too long

After spending what seemed like a lifetime trying to colour in my animation frame by frame, I am still only around 8 seconds into my animation!

Each individual frame takes around 1.5 hours to add colour in each separate shade/tone and outline with black. So, for my animation this would take approximately 450 hours!

It is a shame that this process is too long for this particular short project, as I think that the colour gives the animation a different dimension, and adds to its overall character.

I have, however, rendered the part complete coloured composition, and made this into a movie.