Azure container shared access signature expiring - azure-storage

Question

I'm having trouble with Azure Blobs and Shared Access Signatures when they expire. I need to grant access to a blob for longer than 1 hour (1 year), so I'm using a named container policy, but unfortunately . Its expiring after 1 hr
SharedAccessPolicy sharedAccessPolicy = new SharedAccessPolicy();
sharedAccessPolicy.Permissions = SharedAccessPermissions.Read;
sharedAccessPolicy.SharedAccessStartTime = DateTime.UtcNow;
//sharedAccessPolicy.SharedAccessExpiryTime = DateTime.UtcNow.AddYear(1); No need to define expiry time here.
BlobContainerPermissions blobContainerPermissions = new BlobContainerPermissions();
blobContainerPermissions.SharedAccessPolicies.Add("default", sharedAccessPolicy);
container.SetPermissions(blobContainerPermissions);
Console.WriteLine("Press any key to continue....");
Console.ReadLine();
CloudBlob blob = container.GetBlobReference(path);
string sas = blob.GetSharedAccessSignature(new SharedAccessPolicy()
{
SharedAccessExpiryTime = DateTime.UtcNow.AddDays(7),//add expiry date only when you're creating the signed URL
}
, "default");
Console.WriteLine(blob.Uri.AbsoluteUri + sas);
Process.Start(new ProcessStartInfo(blob.Uri.AbsoluteUri + sas));
Console.WriteLine("Press any key to continue....");
Console.ReadLine();