If the update really does only add 3 hours of content, which tbh I don't really beleive right now, the response absolutely should not be "Ah well, at least 3 hours is a lot". If everyone was promised 6+ hours then it should be 6+ hours. If you ordered at a restaurant and an option was a plate full of food, and upon ordering it you received a a plate only half full your response wouldn't be "ah well, at least there's still food".
That being said there are more people saying it is around 6 hours than there are saying there isn't, so right now I personally beleive Snats did add 6 hours. BUT, if it does turn out to only have 3 hours despite being promised 6 you absolutely should not just sit back and take it. Cuz that will just let the dev keep making empty promises knowing that their fanbase will forgive them when they don't follow through.
Also, on the note of "don't leak and we'll add new content", man I have never seen this work. I've seen someone go out of their way to become a patron just to leak after a dev started spouting this content hostage stuff.
Hope it works out well and I look forward to playing the public release in 5 days.