How important is it to add content to Micro niche sites?

Probably a real stupid question, but how important is it to add content to MND's? How often should I add content, what length articles etc?

As I said, may be a stupid question (already sat on 1 MND for 6 months before I realised your supposed to build links to it )...

depending on your competition...you can maintain your rankings with only 1 article....but more articles = more longtail traffic so if u have time keep adding articles.