There are a lot of articles discussing the fact that users tend to leave a web page in a very short time. Anything from 10 to 30 seconds is what you can expect from a user - and that is generally bad. It's just a fraction longer than a politician has to bring forward her/his opinion before users interest starts to fall.
I could agree that the longer a user stays on a web page the more value it has to the user, and to the site objective (informing, selling, demonstrate, entertain,...). But there must be occasions where this short visiting time isn't valid. I'm thinking of News sites which can have many returning visits and short page visit time (per visit). The same could apply to a weather service, sport result pages and others, where users just need a quick look (and they know where, since they've been here before) and then move to a different site.
Should we be alarmed by short time page visits? Or more particular... Is a short stay on Web Page always bad?
Reference: How long do users stay on web pages?