Lets continue with noah. Lets say after a month or two. Noah thinks he is falling behind, so he decides to work seven days, and ignors the sabaath day. So God going to come down and say, Welp noah, I have you a chance, But you sinned against me and did not obey my sabbath, So no use continuing, You are going to die like the rest of the sinners?
Lets get real. Eventually Noah is going to get wore out, because he is not taking the rest as he was commanded, This will cause him to have to take a break. And God will say, "See, if you did what I asked, you would not be in this situation, but now since you sinned, your suffering the results. What do you think of my command now? You going to stop having faith in me in the future, or learn to follow what I have guided you to do" (also knows as Gods chastening)
Yet people in here would make it known noah would be lost (they may not say it in this situation, but thats what they preach!)