LLM privacy policies take 20 minutes to read on average, study finds

A Bridewell study of 20 popular LLMs found their privacy policies average 4,603 words and about 20 minutes to read, with Meta's Muse Spark policy exceeding 14,000 words. The average Flesch Reading Ease score is 40.2, and 13 of the 20 models use user inputs and outputs for training.

• Average LLM privacy policy is 4,603 words, about 20 minutes to read
• Meta Muse Spark policy tops 14,000 words — nearly an hour of reading
• Average Flesch Reading Ease score of 40.2 signals dense jargon
• 13 of 20 models train on user inputs and outputs