Addressed an issue with token duration usage.

Author: mitchelsellers

src/AspNetCore.Utilities.CloudStorage/AzureCloudStorageProvider.cs

@@ -372,7 +372,7 @@ public string CreateSASUrl(string container, string objectName, int tokenDuratio
                     BlobContainerName = container,
                     BlobName = objectName,
                     Resource = "b",
-                    ExpiresOn = DateTimeOffset.UtcNow.AddHours(1)
+                    ExpiresOn = DateTimeOffset.UtcNow.AddMinutes(tokenDuration)
                 };
                 tokenBuilder.SetPermissions(BlobSasPermissions.Read);
                 return blobClient.GenerateSasUri(tokenBuilder).ToString();