"Maybe you can?t put in the extra time it?s going to demand." That's not a good excuse for leaving a position. It's a good excuse for learning and practicing time management. Is there anybody left who doesn't understand that the quality of "knowledge work" drops precipitously after the 40 hour limit that it took the human race thousands of years to discover? The later you stay, the more mistakes you make, creating more work for yourself next week: a death spiral. In this situation the most important management skill is prioritization. Get the most important tasks done. As for the rest, delegate them, even if it means giving them to someone who won't do them as well as you would. They'll probably do better than you would if you're bleary eyed from overwork. Or renegotiate the due date, or do the most important parts of them, or just let them slide, or find a way to simplify some of your more complex tasks, or skip ten or fifteen of your most boring meetings. Didn't you always want to do that? Now you're a manager, you can say, "Sorry, I have a schedule conflict." If you cannot do any of these things and you find your only choice is to put in fifty hour weeks routinely, THEN you're right. You don't have the skills to be a manager.Too bad so many people don't realize this and set rotten examples for the rest of us by working themselves to death.