The truest test of time for me is whether I'll keep going with this challenge. I have in the past, tried the Legacy Challenge (made it to 5 generations), the Prosperity Challenge (made that to 3 generations) and the Victorian Population Challenge. The last one was just tooooo frustrating. But this one seems to be tailor made to keep your interest up. I've only got 4 families at the minute that I'm working with so rounds won't drag out too long.