how to download all blob from a container where blob sits in sub directory style

I have blob files which sits under container in a sub-directory style,

• container name = log-test
• Year folder
• Month folder
• Date folder
• Hour folder

Through C# background job every hour I need to downloads all the blob files for that Hour folder.

Here in below code I am able to download one file with hard code path (Year/Month/Date/Hour/blob-name), but how to download all the blob file for current date/time hour?

 var blobServiceClient = new BlobServiceClient("conn-str");
        BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient("log-test");

        BlobClient blobClient = containerClient.GetBlobClient("2021/08/11/01/log.txt");

        await blobClient.DownloadToAsync(@"C:\Temp\Result.txt");

Note: - I tried this, but is this a performance issue? Can't I go directly to the actual HOUR folder?

var blobItems = containerClient.GetBlobs().Where(blobItem => blobItem.Properties.LastModified != null 
                                                             && blobItem.Properties.LastModified.Value.Year == DateTime.UtcNow.Year 
                                                             && blobItem.Properties.LastModified.Value.Month == DateTime.UtcNow.Month 
                                                             && blobItem.Properties.LastModified.Value.Day == DateTime.UtcNow.Day 
                                                             && blobItem.Properties.LastModified.Value.Hour == DateTime.UtcNow.Hour)
            .ToList();

        foreach (var blob in blobItems)
        {
            BlobClient blobClient = containerClient.GetBlobClient(blob.Name);

            await blobClient.DownloadToAsync($"C:\\Temp\\{blob.Name.Replace('/','-')}");
        }