Your first reactions to a film are happening within two or three minutes. General impressions start to coalesce and coagulate after 15 or 20 minutes. Your opinions are usually pretty clear at the 30-minute mark, and you know what this movie is 45 to 60 minutes in. So whatever you’re tweeting as you leave the theatre has been kicked around a bit. So I never regret them, although it’s always more satisfying and revealing to deliver a fleshed-out review.