How long does it take you to design a story?

[ThePaSch]

It's the same whenever I start doing anything creative; I'll work on it for hours at the start, but gradually spend less time until I eventually stop half-way through the project. A lack of motivation is what it comes down to, I think.

I know it. It's even more horror than Amnesia.
For my custom story, I have created some sort of organization timeline. Whenever I can, I work one hour a day on it, usually from 4 PM to 5 PM. Then, if I catch myself thinking "aw, come on, I don't want to, it's not like I'm paid to do it and I would rather do something else right now", I add another hour to the next day. 2 Hours were the maximum I stacked up, so it works quite well.
However, right now it's on a hiatus. Lots of stuff to do in good 'ol Real Life.