Help with a custom workflow that monitors the state of objects

Question

I need to write a workflow that monitors the state of an object. (He may wait several days or hours for a change of state)

I have the following states for an object (let's call it an Issue object):

1) Created
2) Unowned
3) Owned
4) UnAssigned
5) Assigned
6) In Progress
7) Signed Off
8) Closed

I would also need to take some action on the object if the object was in a certain state for a certain period (not quite sure how this can be done).

The owner of the object / assignee may change at any time (ie, go from "In progress to"), so I assume that the state diagram of the machine will be used. If my thinking is wrong, please let me know.

My application is written in C # .net 3.5.

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