Google Chat Message Limit:
• API / Bot messages: Maximum size is 32,000 bytes (including text and cards)[reference:0].
• Manual typing (UI): The exact character limit is not officially published, but in practice the UI typically enforces a limit around 4,000–8,000 characters before it starts truncating or refusing input.
• Your 234,234 chars = ~234,234 bytes (approx). You will need to split this into multiple messages (roughly 8–60 messages depending on the UI limit).
• Recommendation: Paste in chunks of 4,000 characters or less to ensure delivery.