Step 1: Mess around in gmod for about five hours.
Step 2: Do something creative in gmod in four minutes that almost feels like having accomplished something.
Step 3: Get a random idea based on whatever it was you did in step 2, mull it over for a few days until it becomes a proper idea for a story. Carefully lay it out, plan ahead and then get to work.
Step 4: Make something that turns out almost completely different from all those plans. Abandon it half-way through due to frustration and laziness.
Step 5: Get another idea for another really long comic several months later, realize you have an old comic that's half-way finished and thus would require less work. Finish said comic, be less than happy with the result, post it on several forums and swear off comic-making forever.
I'd say all in all the whole thing can take upwards of one or two months due to laziness and moments of "This is all so shitty- **** this!", but the actual work usually doesn't take more than two or three days at most. And let's just say I work at less than optimal efficiency.
This particular idea was loosely based on a short story I wrote, ooh... maybe five or six years ago? It didn't really resemble this in terms of plot, but the themes of robots breaking free and nonconformity were there.