Also, you should not be doing the absolute minimum. You should be writing as many posts as are needed. And the emphasis is on quality. Ten posts that are two sentences long won't cut it.
This is actually very similar to asking how long a school paper should be. When given the minimum, do not shoot for that. Shoot to exceed it. Shoot to wow the judge. The Dev Thread is where you convince the reviewer that you know what you're doing and you deserve this creation.
[member="sabrina"]