finished it in around an hour and a half (while stopping to eat dinner).
it's pretty cute and fun to figure out, but definitely not hard. which is not a bad thing! you can't expect all puzzle games to wreck your brain.
i'd say this is a good game for people who don't often play and just want something to do in an off-day, or a group of friends hanging out and playing it together.
it's way too expensive for what it lasts, though.