fix usage whisper time

main.py

@@ -128,7 +128,7 @@ async def usage(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     total_spent=0.0
     total_spent+=(user_info['chatgpt']/750)*0.002
     total_spent+=float(user_info['dalle'])*0.02
-    total_spent+=(user_info['whisper'])*0.006 
+    total_spent+=(user_info['whisper']/60.0)*0.006 
     info_message=f"""User: {update.effective_user.name}\n- Used {user_info["chatgpt"]} characters with ChatGPT.\n- Generated {user_info["dalle"]} images with DALL-E.\n- Transcribed {user_info["whisper"]}min with Whisper.\n\nTotal spent: ${str(total_spent)}"""
     await context.bot.send_message(chat_id=update.effective_chat.id, text=info_message)