For the length, you could first say how long it would approximately take from a new player, and what's the time for someone who's already played it through at least once. I can start. My first three games, Labyronia, Labyronia 2 and Legend of Mysteria took all about 10 hours for a newcomer per game. The ones knowing their way could beat them in 5-6 hours. The development time with eventual remaking them took all in all about 5 months per game. I'm sure many of you could build equally long games a lot faster, but these were my first projects, as I was practicing for the main thing, following. My latest game Labyronia Elements took 90 hours for the first player who made it through without help. Speed running it, I personally managed to beat it in 30 hours. The development took 3 years, although it would've probably taken twice the time if it had been my first game. The question interests me, because I'm currently advertising Elements as one of the largest RM games out there (60-90 hours of playtime). I wouldn't want to be completely out of charts, if there's like 1000 games with nearly 100 hours of playtime.