diff --git a/pdelfin/silver_data/convertsilver_birr.py b/pdelfin/silver_data/convertsilver_birr.py
index 170508e..70cc50c 100644
--- a/pdelfin/silver_data/convertsilver_birr.py
+++ b/pdelfin/silver_data/convertsilver_birr.py
@@ -10,6 +10,9 @@ import smart_open
 
 from pdelfin.prompts import build_finetuning_prompt
 
+# Import Plotly for plotting
+import plotly.express as px
+
 
 def setup_logging():
     """Configure logging for the script."""
@@ -57,9 +60,11 @@ def process_file(input_file: str, output_file: str, rewrite_prompt_str: bool):
     Args:
         input_file (str): Path or URL to the input JSONL file.
         output_file (str): Path or URL to the output JSONL file.
+        rewrite_prompt_str (bool): Flag to rewrite the prompt string.
     """
     processed_count = 0
     error_count = 0
+    prompt_lengths = []
 
     try:
         with smart_open.open(input_file, 'r', encoding='utf-8') as infile, \
@@ -89,15 +94,21 @@ def process_file(input_file: str, output_file: str, rewrite_prompt_str: bool):
                         transformed["chat_messages"][0]["content"][0]["text"] = build_finetuning_prompt(raw_page_text)
 
                 if transformed is not None:
+                    prompt_text = transformed["chat_messages"][0]["content"][0]["text"]
+                    prompt_length = len(prompt_text)
+                    prompt_lengths.append(prompt_length)
+
                     outfile.write(json.dumps(transformed) + '\n')
                     processed_count += 1
                 else:
                     error_count += 1
 
         logging.info(f"Processed '{input_file}': {processed_count} records transformed, {error_count} errors.")
+        return prompt_lengths
     except Exception as e:
         logging.exception(e)
         logging.error(f"Failed to process file {input_file}: {e}")
+        return []
 
 
 def construct_output_file_path(input_file_path, input_dir, output_dir):
@@ -230,6 +241,7 @@ def main():
         tasks.append((input_file, output_file))
 
     # Process files in parallel
+    all_prompt_lengths = []
     with ProcessPoolExecutor(max_workers=max_jobs) as executor:
         future_to_file = {
             executor.submit(process_file, input_file, output_file, args.rewrite_finetuning_prompt): input_file
@@ -239,12 +251,29 @@ def main():
         for future in as_completed(future_to_file):
             input_file = future_to_file[future]
             try:
-                future.result()
+                prompt_lengths = future.result()
+                all_prompt_lengths.extend(prompt_lengths)
             except Exception as exc:
                 logging.error(f"File {input_file} generated an exception: {exc}")
 
     logging.info("All files have been processed.")
 
+    # Plot histogram of prompt lengths
+    if all_prompt_lengths:
+        fig = px.histogram(all_prompt_lengths, nbins=50, title="Histogram of Prompt Lengths")
+        fig.update_xaxes(title="Prompt Length")
+        fig.update_yaxes(title="Frequency")
+        try:
+            fig.write_image("prompt_lengths_histogram.png")
+            logging.info("Histogram of prompt lengths has been saved to 'prompt_lengths_histogram.png'.")
+        except Exception as e:
+            logging.error(f"Failed to save the histogram image: {e}")
+            logging.error("Please make sure that the 'kaleido' package is installed (pip install -U kaleido).")
+            fig.write_html("prompt_lengths_histogram.html")
+            logging.info("Histogram of prompt lengths has been saved to 'prompt_lengths_histogram.html'.")
+    else:
+        logging.warning("No prompt lengths were collected; histogram will not be generated.")
+
 
 if __name__ == "__main__":
     main()