Maximal value of SharedAccessExpiryTime

           // Create the CloudTable object that represents the "people" table.
           CloudTable table = tableClient.GetTableReference(cTableName);

           // creating a shared access policy that expires in 30 minutes.
           // No start time is specified, which means that the token is valid immediately.
           // The policy specifies full permissions.
           SharedAccessTablePolicy policy = new SharedAccessTablePolicy()
           {
               SharedAccessExpiryTime = DateTime.UtcNow.AddYears(1000),
               Permissions = SharedAccessTablePermissions.Query
           };

           // Generate the SAS token. No access policy identifier is used which
           // makes it a non-revocable token
           // limiting the table SAS access to only the request customer's id
           string sasToken = table.GetSharedAccessSignature(
               policy   /* access policy */,
               null     /* access policy identifier */,
               null /* start partition key */,
               null     /* start row key */,
               null/* end partition key */,
               null     /* end row key */);

           return sasToken;