diff --git a/litellm/litellm_core_utils/audio_utils/utils.py b/litellm/litellm_core_utils/audio_utils/utils.py
index ea594bd9a73..dee5f0cc0e7 100644
--- a/litellm/litellm_core_utils/audio_utils/utils.py
+++ b/litellm/litellm_core_utils/audio_utils/utils.py
@@ -343,9 +343,10 @@ def calculate_request_duration(file: FileTypes) -> float | None:
         # Extract duration using soundfile
         file_object: Final = io.BytesIO(file_content)
         with sf.SoundFile(file_object) as audio:
-            if len(audio) >= LIBSNDFILE_UNKNOWN_FRAME_COUNT:
+            frames: Final = len(audio)
+            if frames >= LIBSNDFILE_UNKNOWN_FRAME_COUNT:
                 return None
-            duration: Final = len(audio) / audio.samplerate
+            duration: Final = frames / audio.samplerate
             return duration
 
     except Exception:
diff --git a/litellm/proxy/pass_through_endpoints/llm_provider_handlers/transcribe_passthrough_logging_handler.py b/litellm/proxy/pass_through_endpoints/llm_provider_handlers/transcribe_passthrough_logging_handler.py
index 40aba7e4df6..ec189b83195 100644
--- a/litellm/proxy/pass_through_endpoints/llm_provider_handlers/transcribe_passthrough_logging_handler.py
+++ b/litellm/proxy/pass_through_endpoints/llm_provider_handlers/transcribe_passthrough_logging_handler.py
@@ -524,9 +524,10 @@ async def write_media_within_limit(response: httpx.Response, media_file: IO[byte
 def media_file_seconds(path: Path) -> float | None:
     try:
         with soundfile.SoundFile(str(path)) as audio:
-            if len(audio) >= LIBSNDFILE_UNKNOWN_FRAME_COUNT:
+            frames: Final = len(audio)
+            if frames >= LIBSNDFILE_UNKNOWN_FRAME_COUNT:
                 return None
-            return len(audio) / audio.samplerate
+            return frames / audio.samplerate
     except (RuntimeError, ValueError, OSError) as e:
         verbose_proxy_logger.warning("Transcribe media could not be decoded for its duration: %s", e)
         return None