How long does it take to make a single completed cel (roughly)?
Bearing in mind that these are digital cels, not paint on plastic (and yes, we’ve been using all-digital cels since 1994, long before Blue Submarine)…it’s hard to say, because it’s never done in a straight line like that. Typically, the whole sequence is roughed out, then cleaned up, tweened, and shaded, then painted. And that doesn’t count compositing. It also depends on the complexity of the cel. As a wild guess I’d say 3 or 4 hours.