WCF/WF - Delay Activity (Persistence) for 15 days

Hi all,

    i have a one problem in my solution i.e I have a one workflow, while running the workflow i want to Hold the service for 15 days,now i am hold the service for 10 mins after 10 mins getting a time out exception like


"This request operation sent to net. Pipe://localhost/NewPolicyHolderSurvey did not receive a reply within the configured timeout (00:01:00).  The time allotted to this operation may have been a portion of a longer timeout.  This may be because the service is still processing the operation or because the service was unable to send a reply message.  Please consider increasing the operation timeout (by casting the channel/proxy to IContextChannel and setting the OperationTimeout property) and ensure that the service is able to connect to the client.

"How to acheive this problem if i  configuration in a app.config only up to 99 hours only but my requirement is 15 days delay for that workflow