God gave Noah many instructions on how to build the ark. It took Noah 120 days to build it. The rabbis ask: \”Why did it take him so long?\” And the answer: \”God was giving Noah a chance to talk to his neighbors.\” The neighbors would come up to Noah and say: \”Why are you building this ark?\” And Noah was supposed to say: \”Because God is sending a flood to destroy all you wicked people.\” Chances are, many of the wicked people would have repented and been saved. But Noah was too shy to talk to his neighbors. And so, he built his ark, got into it and sailed away, while everyone else drowned.