With a wonderful business, you can figure out what will happen; you can't figure out when it will happen. You don't want to focus on when, you want to focus on what. If you're right about what, you don't have to worry about when
If a problem is fixable, if a situation is such that you can do something about it, then there is no need to worry. If it's not fixable, then there is no help in worrying. There is no benefit in worrying whatsoever.