I'm not quite sure what you mean by "which doesnt work". I'm not understanding is you mean that there is a syntax error or the functionality is not what you want.
But going back now to your real question is how to track the amount of time in each status, I have done that for another client recently, and it can be done but it's a bit complicated. The issue is that you essentially need to populate a date/ time field for when the record is created, which is of course easy as that is simply the [Date Created], but then you would have a button to edit that same record in another field to "stop it's clock".
That would need some one on one coaching time to get that working. Contact me via the information in my profile or at QuickBaseCoach.com for personal one on one assistance with this.
It is also possible that something could be done with the new Actions, which are a new feature of Quick Base. Maybe we could have the Action update the time elapsed in each Status. That is another approach.