There are two traps that business leaders can fall into. They are good times and bad times.
In good times, business leaders can be tempted to keep working harder and longer hours because they never know how long the good times will last. In bad times, business leaders can be tempted to keep working harder and longer hours because they feel they have to work their way through the bad times.
Don’t do that.
Work reasonable amounts of time as well as you can and then stop. Recover. Recharge your batteries. Regain your perspective. Take care of your body. Do this often. Don’t wait until you’re wiped out to start to recover. Don’t wait for mediocre times. Make recovery a proactive event, not a last-ditch effort to survive, in both good times and bad times.
Here’s an article called The Making of a Corporate Athlete. It has some great points on this topic.